Category: ecology

Ancient ecosystem reconstructed using fossil DNA

December 9, 2022 • 10:30 am

The oldest DNA sequenced up to now was from a mammoth molar preserved in permafrost, and was dated about 1.2 million years ago. Now a group of scientists, excavating a 100-meter-thick layer of frozen soil in the “polar desert” of northern Greenland, not only found short stretches of DNA that identified the plants, animals, and algae present a long time ago, but also showed that that the time was at least two million years ago.

This is the oldest fossil DNA ever sequenced; it was preserved because it had been adsorbed to minerals in frozen soil. And although the stretches of DNA had degraded into short bits—about 50 base pairs long—they were sufficiently similar to modern taxa that they could identify the groups from which they came. In fact, they could reconstruct the whole ecosystem of that area 2 million years ago. It was much richer in flora and fauna than today’s polar desert, for at that time Greenland wasn’t covered with ice, it was much warmer (mean summer temperature about 10°C), and organisms could migrate to Greenland over land bridges. This might give us a hint of what kind of ecosystem could develop (minus the animals, which are largely gone) should global warming melt the ice presently in Greenland.

You can read the Nature paper for free by clicking on the screenshot below (the pdf is here, reference at the bottom). Below that is a clickable and short popular account of the findings, also published in Nature.

The News article for tyros (short; click to read):

Here’s the location of the area analyzed in northern Greenland, Kap København, where the layer of soil occurred (yellow star). The layer’s presence was already known, and some of the samples had been dug up in 2006 and had been sitting in a Copenhagen freezer for 16 years. Somebody had a bright idea to see if they could identify and sequence the DNA in that soil, and it worked!

(from the paper): a. Location of Kap København Formation in North Greenland at the entrance to the Independence Fjord (82° 24′ N 22° 12′ W) and locations of other Arctic Plio-Pleistocene fossil-bearing sites (red dots). b, Spatial distribution of the erosional remnants of the 100-m thick succession of shallow marine near-shore sediments between Mudderbugt and the low mountains towards the north (a + b refers to location 74a and 74b).

Small stretches of DNA were sequenced and compared to modern DNA as well as DNA inferred in ancestors of modern taxa. The DNA had of course degraded, but they found stretches about 50 base pairs long. Comparisons were mostly to mitochondrial DNA for animals and to conserved chloroplast or other plastid DNA from plants. (They also found ancient pollen that they used in conjunction with the DNA data.)

On the right you can see what animals were found, mostly identified to genus or family because there wasn’t enough DNA to do a finer analysis. I’ll put a list of what they found below this figure:

(from paper): Taxonomic profiles of the animal assemblage from units B1, B2 and B3. Taxa in bold are genera only found as DNA

Here’s what they found from the DNA; these were all organisms living roughly at the same time about 2 million years ago. And remember, that area now harbors very little life.

A mastodon! The figure below shows its placement on the phylogenetic tree of elephants.

70 genera of vascular plants, including sedges, horsetails, willows, hawthorns, spruce, poplars, yew, and birch. Some of these no longer grow in Greenland, but the mixture of plants includes those found in much warmer habitat. See the paper for a full list.

Algae, fungi, and liverworts

Marine phytoplankton and zooplankton

A hare

A caribou-like cervid (caribou are another name for reindeer). How did they get to Greenland? Presumably it wasn’t an island then, but we don’t know for sure.

A bird related to modern geese

A rodent related to modern lemmings

Reef-building coral

An ant

A flea

A horseshoe crab (identified as Limulus polyphemus, the modern horseshoe crab, regarded as a living fossil). These days Limulus doesn’t breed north of the Bay of Fundy (about 45° N), while the location of this site was 82° N. That shows how much warmer it was in Greenland then, though of course the crabs could have evolved in the last several million years to be acclimated to warmer waters.

There were no carnivores found; all the animals were herbivores. That doesn’t mean that there weren’t carnivores there, but I doubt it.

 

(From paper): b, Phylogenetic placement and pathPhynder62 results of mitochondrial reads uniquely classified to Elephantidae or lower (Source Data 1). Extinct species as identified by either macrofossils or phylogenetic placements are marked with a dagger.

The upshot: Well, we know how that DNA sequences can be preserved for twice as long as we thought, though it has to be under very special circumstances. More important, if you find areas (and they’ll have to be in cold regions) where you can extract even small sequences of fossil DNA, you might be able to reconstruct whole ecosystems. What we’ve found are animals and plants that weren’t expected to be there (reindeer, horseshoe crabs, hawthorns) and so on—species adapted to warmer habitats or now found in areas not in Greenland.

There are two explanations for this: the related today have lost their adaptations to cold habitats when they were forced out of Greenland as the ice caps formed, or the climate was simply warmer. (Of course, both could apply.) But know the latter is surely a contributing factor from independent evidence about climate. Still, there could have been some evolutionary change in thermal tolerance as well, something for which we can’t really get evidence.

But these different explanations aren’t that important: what is important is that we’re able to reconstruct entire ecosystems from fossil DNA—DNA twice as old as previously known. I’ll let the authors have the last word (from the paper):

No single modern plant community or habitat includes the range of taxa represented in many of the macrofossil and DNA samples from Kap København. The community assemblage represents a mixture of modern boreal and Arctic taxa, which has no analogue in modern vegetation. To some degree, this is expected, as the ecological amplitudes of modern members of these genera have been modified by evolution. Furthermore, the combination of the High Arctic photoperiod with warmer conditions and lower atmospheric CO2 concentrations made the Early Pleistocene climate of North Greenland very different from today. The mixed character of the terrestrial assemblage is also reflected in the marine record, where Arctic and more cosmopolitan SMAGs of Opistokonta and Stramenopila are found together with horseshoe crabs, corals and green microalgae (Archaeplastida), which today inhabit warmer waters at more southern latitudes.

. . . In summary, we show the power of ancient eDNA to add substantial detail to our knowledge of this unique, ancient open boreal forest community intermixed with Arctic species, a community composition that has no modern analogues and included mastodons and reindeer, among others. Similar detailed flora and vertebrate DNA records may survive at other localities. If recovered, these would advance our understanding of the variability of climate and biotic in

Will northern Greenland be like this again should global warming continue? I doubt it, for many of the species, like caribou, can no longer get there, and some, like mastodons, are simply extinct. But it’s enough to know what was there two million years ago.

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Kjær, K.H., Winther Pedersen, M., De Sanctis, B. et al. A 2-million-year-old ecosystem in Greenland uncovered by environmental DNA. Nature 612, 283–291 (2022). https://doi.org/10.1038/s41586-022-05453-y

Does anybody want to read a long paper?

August 27, 2020 • 11:00 am

I really did try to read this Science paper about urban ecology and systemic racism, first reading it quickly, as I’m wont to do, and then starting to delve in, “perusing” it in the proper sense. But I had to give up on several grounds:its  length (18 pages, one of the longest papers I’ve ever seen in Science), terrible academic writing in a postmodern style (dry as dust), an absence of original data, and, apparently, an explicitly political agenda that comes out in the end.

Given that I didn’t read the entire paper carefully, I can’t really assess its value, but I provide a link to the free paper below (pdf here, link at the bottom).  If you’d like to see it, I’ll send a pdf, but perhaps at least one reader can plow through it and put its message into plain English. To me the message seems to be: “Structural racism in America has affected minority communities in a way different from white communities with respect to their ecology (heat distribution, tree cover, etc.), and we need to take this into account this when doing urban ecology. And this also means that ecologists need to become anti-racism activists.”

Click on the screenshot to read it:

The abstract:

Here are two bits that put me off. The first is about intersectionality, which I don’t see as relevant to their question (bolding in text is mine).

Intersecting forms of inequality

Understanding the mechanisms shaping urban inequality and thus urban eco-evolutionary patterns and processes requires incorporating intersectional theories of inequality and evaluating accessibility to different spaces (34, 138, 139). The term “intersectionality” emphasizes that various marginalized identities of an individual or community more broadly intersect, compound, and interact, which ultimately impact the magnitude and severity of experienced social inequities (Fig. 1) (57). For example, discrimination for a queer Black woman in the United States may be intensified relative to individuals with similar racial, gender, and sexual orientation identities alone. Translating the concept of intersectionality onto the urban landscape can provide a more holistic understanding of the patterns and processes shaping urban ecosystems. For instance, we may hypothesize that characteristic differences between Indigenous ecological practices and forestland managers may contribute to variance in native species richness and community complexity. (140, 141). Similarly, we may predict that gender differences in land cultivation and homeownership shape plant species assemblages and species turnover rates. Further, vegetation removal and increased nighttime lighting to deter LGBTQIA+ communities (95) may have subsequent effects on disturbance regimes and local biodiversity that reduce habitat value for multiple species. Though such empirical links are currently speculative and not well established, integration of various inequities in cities may provide additional resolution to understanding how social drivers impact urban ecology and evolution. While our focus has been on racism and classism, we recognize the need for and encourage intersectional approaches in urban ecology.

It’s not clear to me that intersectionality as defined in the article has anything to do with the three hypothetical analyses they propose.

The bit below seems to me one of the real auns of the paper—to call for political change. That’s very different from doing the science, i.e., trying to understand how racial oppression, poverty, and class have affected patterns in urban ecology. One can say, for instance, that there are real effects, but ecologists might respond that there are other problems on their minds, like global warming and extinction of species outside of urban environment, that are also important, and reject the argument about what their activist priorities should be.

As urban ecologists and evolutionary biologists, we have a responsibility to implement anti-racist strategies that interrogate systems of oppression in how we perform our science. This necessarily means eradicating efforts that perpetuate inequities to knowledge access, neglect local community participation, or exploit community labor in the pursuit of academic knowledge (i.e., the practices of colonial and parachute science). Concurrently, increasing representation of individuals of diverse identities is inherently just and enhances our scholarship (166, 167). By directly including a diversity of scholars and incorporating an understanding of systemic racism and inequality, we can more holistically study urban ecosystems. We will not be able to successfully assess how racism and classism shape urban ecosystems – nor address their consequences – without a truly diverse and inclusive scientific community.

Again, I haven’t read the whole paper carefully, though I have read it quickly. I’d welcome anybody biting the bullet here.

 

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Schell, C. J., K. Dyson, T. L. Fuentes, S. Des Roches, N. C. Harris, D. S. Miller, C. A. Woelfle-Erskine, and M. R. Lambert. 2020. The ecological and evolutionary consequences of systemic racism in urban environments.  Science,Published online 13 August, 2020. DOI: 10.1126/science.aay4497

ZeFrank on snails that surf (and his Earth Day Awards)

May 3, 2020 • 12:30 pm

Is it my imagination, or is ZeFrank getting more biology into his posts than before? This is a good one, with a lot of good biology but also with the usual humor. It’s also scary!  Look at that radula!

The species at issue is the suspension-feeding and surfing sea snail Olivella semistriata and its predator Agaronia propatula.

I suppose ZeFranks gets his videos from others (there are some credits at the end), but I don’t know for sure.

And another recent ZeFrank video, this time highlighting the “Earth Day Awards” for the most “special” animals.

h/t: Rick

In a ludicrous attempt to combat the coronavirus, Spain bleaches an ecologically important beach

April 30, 2020 • 9:15 am

You can argue about which pandemic precautions taken by national governments are superfluous or overreactions, but this one definitely falls into the last class. The BBC reports (click on screenshot):

This is a really boneheaded move, especially in light of the site’s ecological importance (see Adam Rutherford’s remarks below). The BBC says this:

Zahara de los Atunes, near Cadiz, used tractors to spray more than 2km (1.2 miles) of beach with a bleach solution a day before Spain allowed children out of lockdown for the first time.

Environmentalists say the move caused “brutal damage” to the local ecosystem.

Spain has been badly affected by the coronavirus, with 23,800 deaths.

It recently announced a four-phase plan to lift its stringent lockdown measures and return to a “new normality” by the end of June.

María Dolores Iglesias, who heads an environmental volunteer group in the Cadiz region, said she had visited the beach at Zahara de los Atunes and seen the damage for herself.

She said the bleach “killed everything on the ground, nothing is seen, not even insects”.

The beach and its dunes are protected breeding and nesting places for migratory birds and Ms Iglesias said she had seen at least one nest with eggs destroyed by the tractors.

. . .Local official Agustín Conejo admitted it was “a wrong move”.

“I admit that it was a mistake, it was done with the best intention,” he said.

Mr Conejo said they had wanted to protect children who were coming to see the sea after six weeks in confinement.

The Andalusian regional government is now considering fining the local authority for its action, El Pais newspaper reports.

Had they asked the government, or any scientist or rational physician, they would have been told that there is no danger in people contracting coronavirus from a beach itself, particularly one that has been closed down for several months. Yes, you can get it from other people on the beach, but bleaching a beach is not going to help that.

Think of all the animals killed by this ridiculous move.  Biologist, geneticist and writer Adam Rutherford, who spent some of his formative time as a biologist on that beach, and reported this article to me, gave me permission to quote his email, which he signed “In despair”:

Jerry, here’s a thing that might grind your gears. Steve Jones has been running a field trip to a little village on the very southern coast of Spain for second-year undergraduates for decades now, called Zahara de los Atunes. You can see Africa on a clear day. It’s a place where they have fished tuna for centuries as they migrate in and out of the Med using this brutal but effective technique called Almadraba.

I went in ’95; it is the highlight of the evolution undergraduate experience at University College London: field work on Aquarius, mark-recaptures on beetles, various snails, and our first taste of our own research projects – mine was a rather naive observation of how manipulating floral symmetry affected pollinator visits (and I continued on symmetry in stalkies for the next couple of years). More important, as I’ve said dozens of times, learning statistics on the roof of a hotel on the beach with a beer, is by far the best way to make it stick. I’ve been back twice now when travelling round Andalusia.

Steve will fill you in on the details. Anyway, the Spanish authorities bleached 1.2 km of the beach to combat coronavirus. Absolute batshit insane lunacy.

I knew of that course well. It was originally co-taught with Nick Barton before he moved to Edinburgh; and the course had a terrific reputation. Steve Jones, emeritus professor at UCL, snail researcher, author, and one of my collaborators on fly work, added his own comment about the bleaching of the place where he taught:

It strikes me as a potty idea. They probably killed a few hundred thousand snails, and perhaps ten times as many beetles (we used to do mark-recapture experiments to count the numbers, which were always huge, with most of the animals below the surface). I can’t imagine that the spray did much good to the lilies, cistus and other flowers we did experiments on, but this is the Mediterranean/Atlantic spring, and I think that the plants will bounce back pretty quick. Most of it seems to have gone onto the dunes, with lots of migratory and nesting birds at this time of year (it’s a major fly-way across from Africa). One thing it will not damage will be the coronavirus for that has its reservoir in people and not on sand.

 

New movie by Michael Moore on our despoliation of Earth

April 24, 2020 • 12:30 pm

Michael Moore has put his latest movie, “Planet of the Humans” free on YouTube. It’s directed and narrated by Jeff Gibbs (Moore is the executive producer) and is 1 hour and 40 minutes long: just right for quarantine watching. I have to admit that I haven’t yet seen it, but I surely will. (I regard watching videos, or television, as luxuries that induce in me a sense of guilt.) But what I gather is that—as with all Moore’s films—it’s Manichaean, and two of the villains here are the mainstream environmental movement and “green energy”. The lesson seems to be that we’re doomed unless we practice stringent population control.

Here are the YouTube notes:

Michael Moore presents Planet of the Humans, a documentary that dares to say what no one else will this Earth Day — that we are losing the battle to stop climate change on planet earth because we are following leaders who have taken us down the wrong road — selling out the green movement to wealthy interests and corporate America. This film is the wake-up call to the reality we are afraid to face: that in the midst of a human-caused extinction event, the environmental movement’s answer is to push for techno-fixes and band-aids. It’s too little, too late.

Removed from the debate is the only thing that MIGHT save us: getting a grip on our out-of-control human presence and consumption. Why is this not THE issue? Because that would be bad for profits, bad for business. Have we environmentalists fallen for illusions, “green” illusions, that are anything but green, because we’re scared that this is the end—and we’ve pinned all our hopes on biomass, wind turbines, and electric cars?

No amount of batteries are going to save us, warns director Jeff Gibbs (lifelong environmentalist and co-producer of “Fahrenheit 9/11” and “Bowling for Columbine”). This urgent, must-see movie, a full-frontal assault on our sacred cows, is guaranteed to generate anger, debate, and, hopefully, a willingness to see our survival in a new way—before it’s too late.

Featuring: Al Gore, Bill McKibben, Richard Branson, Robert F Kennedy Jr., Michael Bloomberg, Van Jones, Vinod Khosla, Koch Brothers, Vandana Shiva, General Motors, 350.org, Arnold Schwarzenegger, Sierra Club, the Union of Concerned Scientists, Nature Conservancy, Elon Musk, Tesla.

Music by: Radiohead, King Crimson, Emerson, Lake & Palmer, Blank & Jones, If These Trees Could Talk, Valentina Lisitsa, Culprit 1, Patrick O’hearn, The Torquays, Nigel Stanford, and many more.

I’ve put some links to reviews below the video:

Rotten Tomatoes: Based on only a handful of reviews, this site gives the movie a critics’ rating of 80% and an audience rating of 70%.

Gizmodo says the movie starts out well, but then goes “full ecofacism”, by which the critic means “population control” An excerpt:

What’s most frustrating about Gibbs’ film is he walks right up to some serious issues and ignores clear solutions. The critique of the compromised corporate philanthropy model is legit. We should absolutely hold nonprofits to account when they don’t live up to their missions. But the solution isn’t to take the leap to population control. It’s to tax the rich so they can’t use philanthropic funding as cover for their misdeeds while simultaneously filling government coffers to implement democratic solutions.

The Guardian gives it four stars out of five, calling it “refreshingly contrarian”, but short on solutions:

Most chillingly of all, Gibbs at one stage of the film appears to suggest that there is no cure for any of this, that, just as humans are mortal, so the species itself is staring its own mortality in the face. But he appears to back away from that view by the end, saying merely that things need to change. But what things and how?

It’s not at all clear. I found myself thinking of Robert Stone’s controversial 2013 documentary Pandora’s Promise, which made a revisionist case for nuclear power: a clean energy source that (allegedly) has cleaned up its act on safety and really can provide for our wholesale energy needs without contributing to climate change, in a way that “renewables” can’t.

Gibbs doesn’t mention nuclear and – a little lamely, perhaps – has no clear lesson or moral, other than the need to take a fiercely critical look at the environmental establishment. Well, it’s always valuable to re-examine a sacred cow.

The Hollywood Reporter gives it a basically neutral review with some criticism:

Planet of the Humans certainly makes many important and illuminating points, especially about the co-opting of environmental causes by corporate interests who use it mainly for positive branding purposes. But its despairing tone and overall atmosphere of purity testing may have the counterproductive effect of making you want to throw up your hands and ignore the environmental movement’s significant progress in recent decades. The loosely structured assemblage of damning information eventually proves more numbing than illuminating.

“Now, I know this all might seem overwhelming,” Gibbs tells us near the end of the film, and he’s right. His ultimate solution to what he describes as a “human-caused apocalypse” is to stem population growth. Presumably, a global pandemic isn’t what he had in mind.

Variety, though calling it “cluttered and ungainly”, recommends it nevertheless:

But that is the point, insofar as there is a clear one here: Gibbs says “the elephant in the room” isn’t climate change or any other individual factor, but humanity itself. With our species’ population having skyrocketed in the last 200 years, we are simply in denial that mankind’s needs are exhausting Earth’s resources. “Infinite growth on a finite planet is suicide,” he says, as bleak footage of rampant deforestation (in large part to supply the dubious “clean energy” source of biomass) provide just one vivid proof. There is no obvious solution, save a massive scaling-back that capitalism-driven societies don’t even want to think about.

There’s nothing particularly elegant about the way “Planet of the Humans” arrives at that downbeat thesis. Though well-shot and edited, the material here is simply too sprawling to avoid feeling crammed into one ungainly package even narrator Gibbs admits “might seem overwhelming.” Still, medicine is medicine, and if these 100 minutes leave a bitter taste, you’re still probably better off for having swallowed their dose of sobering awareness.

So watch it if you want, leave any comments below, and be aware that this isn’t light entertainment!

Now they come for Smokey Bear. . .

November 12, 2019 • 9:30 am

If I tell you that the following article is from HuffPost (yes, I’m cooling my heels on a docked ship), could you tell me whether the answer is “yes” or “no”?

The answer, of course, is “yes”, as you probably guessed. As cultural icons are “canceled” one by one, Smokey (remember: it’s Smokey Bear, not Smokey The Bear) was doomed. Why? According to HuffPost, the subheading gives the reasons: “his advice is outdated, incomplete, and ignores climate change.”

But if you grew up with the 75-year old ursine icon, and often saw signs like the one below, you’ll be puzzled. For Smokey’s job was to keep humans from being careless about fire in the wilderness, that, is, he was created to prevent anthropogenic fires, not fires by lightning or other natural causes. After all, you can’t prevent a fire caused by lightning. But being sure that you’re careful with campfires and matches is not outdated advice, nor does it ignore climate change!

But is Smokey’s advice incomplete? Apparently so, for it lacks nuance (always run when you see that word!).  Why? Because, as scientists have known for a long time, some ecosystems depend on regular natural fires for their maintenance, and when those are prevented, the ecosystem changes.

Many conifer forests, for example, depend on fairly regular natural fires to prevent overgrowth (see more in this article), to retain some fire-dependent species (i.e., red pine) from being displaced by deciduous trees, and to create a mixture of live and dead trees essential for some wildlife. The red-cockaded woodpecker and black-backed woodpeckers are fire-dependent bird species. Nowadays controlled fires are often set to keep ecosystems as natural as possible.

And so HuffPost calls out Smokey for his ignorance:

The aggressive fire exclusion Smokey championed proved detrimental to long-term ecosystem health, leaving forests choked with a dangerous amount of vegetation that can fuel catastrophic fires ― a phenomenon that scientists have dubbed “the Smokey Bear effect.” Climate change is only making these infernos worse, with year after year of bigger, more erratic and highly destructive wildfires.

In other words, Smokey ― the most important figure in fire prevention and the longest-running public service advertising campaign in U.S. history ― may be a net negative for the environment.

. . .Smokey’s enduring legacy is, well, complicated. In a 2013 paper titled “Be careful what you wish for,” two Forest Service researchers wrote that Smokey’s success in preventing fire “has come at considerable cost,” including a “decline in forest health, an increase in fuel loads in some forests, and wildfires that are more difficult and expensive to control.” 

And yet aggressive fire suppression remained “the order of the day.”

Two responses. First, the suppression of natural forest fires in habitats where they are needed to maintain ecosystem health is not Smokey’s fault! This came from a general scientific ignorance about fire-dependent habitats. I seriously doubt that firefighters put out such fires because of Smokey. Further, even natural fires were, and are, still being extinguished when they endanger human habitation. That’s what happens when humans infringe on natural habitat. Further some natural fires occur in habitats that don’t depend on regular burning for their maintenance. Those, too, should be controlled.

Further, Smokey’s dictum has always been directed toward campers and hikers, not at firefighters. To several generations of Americans, it was “be very careful with matches and campfires in the wilderness.” That was good advice, and remains so.

Now comes the bit that makes me laugh. It’s not just individuals who cause fires by ignoring Smokey’s message. It’s those blasted corporations! Where is Bernie when we need him? So the word “you” in Smokey’s message “Only you can prevent wildfires” is misguided. “You” can be Pacific Gas and Electric, and so Smokey lacks nuance!

Yet Smokey Bear’s message has remained largely the same. The only change to his signature catchphrase came in 2001, when it was updated from “Only YOU can prevent forest fires” to “Only YOU can prevent wildfires,” to account for the fact that fire is not limited to forests. But while about 85 percent of wildland fires in the United States are human-caused, some of the worst fires in recent years, including last year’s Camp Fire, the deadliest and most destructive blaze in California’s history, were started not by careless individuals but by California’s investor-owned utility.

Perhaps his name should be changed to Bernie Bear! (The “Burn” homonym would be a nice touch.)

Finally, Smokey’s message has been updated to reflect fire-dependent ecosystems! HuffPost mentions the extensive information on Smokey’s website about fire-dependent ecosystems (see the piece below as well as this one on the “Benefits of Fire“), but largely ignores it, so intent are they on demonizing this poor ursid.

Global warming will worsen the probability of wildfires, both natural and anthropogenic, but Smokey’s message to humans remains relevant regardless of climate change. Yes, Smokey’s message can be updated, but how often does anybody really see a Smokey Bear ad these days? Here are some suggestions about how to update him:

Sarah Berns of Winthrop, Washington, has worked on both sides of wildland firefighting, first as a Forest Service smokejumper and later in fire prevention. In August she published a piece in Outside magazine arguing that Smokey “desperately needs a makeover.”

. . . Berns says Smokey’s transformation should be drastic. In her Outside piece, she calls for swapping Smokey’s “dad jeans for green firefighting pants and a yellow shirt,” giving him a new voice that appeals to a younger, more diverse audience, and putting him to work on prescribed burns. “Smokey, pick up a drip torch and lead by example,” she wrote.

Yep, Smokey is bad because he’s a Boomer Bear! Dump those dad genes! I’m not sure what voice would appeal to a “younger more diverse audience” since Smokey’s already a bear of color, but I’ll leave that to the ad people.

It’s certainly important to educate the public about the positive role of wildfires, but more important to educate the firefighters and naturalists, who, of course, are already learning. Smokey’s influence has waned, and I haven’t heard of him in years. But his message—to be careful about fires in the wilderness—has stayed with me since I was a kid. This whole article could have been written without the extensive attacks on a lovely and useful symbol, but that’s now how the kids roll.

A lovely video about Arctic animals

July 25, 2019 • 2:30 pm

As reader Michael notes, this 11-minute National Geographic video on Arctic animals (released just today) gives too much time to the cameraman, but is well worth watching to see the polar bears, arctic hares, lemming, snowy owls, ptarmigans, and—my personal favorite—the adorable, cat-sized Arctic fox. The fox does its famous acoustically-oriented snow dive (note its reddish-brown feet), and a silent snowy owl picks off a hapless lemming. It’s a land of white animals (except for the lemmings, who suffer for their coloration).

Lagniappe: a lovely Aurora Borealis appears at the end.

You can see part 1 here and part 2 here. Polar bear fight club!