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The Sixth Mass Extinction: fact, fiction or speculation?

65 pointsby khaled_ismaeelover 3 years ago

8 comments

titzerover 3 years ago
When I was a kid, I always thought that where I grew up (southern Indiana) was basically a forest and that the farms and towns and roads that I saw were just &quot;nestled&quot; in the forest. That&#x27;s because everywhere you look, there&#x27;s almost always a line of trees on the horizon. Not being particularly mountainous, or even hilly, it looks from a distance like the tree line is the &quot;forest&quot;. In pretty much every direction. I was a boy scout, and we did a lot of camping at various parks. I really didn&#x27;t know exactly where I was, I just thought we were out in the &quot;forest&quot;.<p>It&#x27;s a trick of perspective. I had never really seen my local area from the sky until about 2000. Now, Google Earth can show you the whole thing, at zoomable resolution.<p>Boy, was I wrong. Not only is southern Indiana mostly <i>not</i> forest, it&#x27;s mostly farms, roads, and fields, and towns, with only scattered lines and splotches of trees. In reality, those boy scout trips were basically in nature preserves and national forests, the few remaining places of actual forest. Human habitation has absolutely <i>decimated</i> the forest...across the entire midwest. And the many millions, billions of animals that lived in the forest, they&#x27;re gone, numbers dwindled, or exinct. Bears and big cats and wolves and elk....almost all gone here. Not to mention the intricate ecosystems full of life, from squirrels down to insects and ants...uncountable the individual living things that have been absolutely obliterated by our hunger.<p>Just take a look at Google Earth, switch to satellite mode, turn off all labels, and take in the vast green patchwork of farms that stretches for a thousand miles in every direction in the middle of North America. There is precious else <i>but</i> farm and city and road.
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thrown_22over 3 years ago
One thing we always see when a mass extinction happens is that mega fauna goes first. Large animals can&#x27;t hide, unlike rat sized ones. Currently so much of the mega fauna outside of Africa has disappeared that we don&#x27;t even think most continents had any: <a href="https:&#x2F;&#x2F;en.wikipedia.org&#x2F;wiki&#x2F;Megafauna#Megafaunal_mass_extinctions" rel="nofollow">https:&#x2F;&#x2F;en.wikipedia.org&#x2F;wiki&#x2F;Megafauna#Megafaunal_mass_exti...</a><p>That would suggest we&#x27;re 10,000 years into one, rather than being at the early stages of it.
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another_storyover 3 years ago
Wouldn&#x27;t it be best to act as if it&#x27;s fact, even without definitive evidence one way or another? Otherwise it&#x27;s like deciding to not drive cautiously on a mountain road because your GPS isn&#x27;t sure if there&#x27;s a sharp turn ahead.
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jimmyvalmerover 3 years ago
That book really hit home for me the insignificance of human versus planetary timescales. For all our handwringing about global warming, we&#x27;re actually in an ice age. Even if we solve climate change, the earth will continue to witness unfathomably long geologic eras long after we&#x27;re gone.
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lettergramover 3 years ago
I like to bring this up, but 8,000 years ago half of North America was under ice. That means that every living creature in that region didn’t exist. Every creature unique to those regions came about in the last 8,000 years.<p>1. I think evolution happens much faster than people realize<p>2. Extinctions happen more quickly than people realize<p>3. Humans likely were the cause of many extinctions through pollution and cultivation. But other animals and plants are currently filling the niche and containing to expand.<p>I would really like to understand the distribution of species over the last 10k, 100k, 250k, 1m years. We simply don’t have great data so it’s really hard to say. What I can say, is that there’s a ton of life. Life doesn’t appear to have diminished much on a whole. Which is comforting, at the very least.
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nr2xover 3 years ago
Highly recommend reading Kolbert&#x27;s book.
tjr225over 3 years ago
Are abstracts typically filled with this much editorial? I’m no climate science denier but adjectives like “sad” seem insanely out of place in something like this…
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mistrial9over 3 years ago
spoiler: FACT
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