Okay, the idea that Earth is going to be completely uninhabitable doesn’t give humans enough credit. But it is going to mess a lot of things up.
And a jump from 300 to 400 ppm is
huge. Granted, CO[sub]2[/sub] isn’t a big part of our atmosphere to begin with, but if it was 0 ppm, then Earth would be too cold to live on.
And a jump from 300 to 400 ppm is an increase by a third of what it was before, and we’re not done as far as we can tell. And
Earth’s climate has already warmed by about a degree and a half Fahrenheit since the late 1800s, most of that since the 1970s. For the record, the Ice Age was a difference of about 8 degrees Fahrenheit, which we as a world are on track to break, but going the other direction, by 2100.
The Northwest Passage reliably opened for the first time in history in 2013. The government of Kiribati is already planning mass evacuations to get everyone out of the country before it sinks. St. Louis has already
lost its below-zero days. As mentioned before, Walden is blooming two weeks early.
There is a mountain of evidence that global warming is happening. Pretending it isn’t will simply make it worse.
Then again,
it might be fun.