More from the “Earth: the Operators Manual” team.
One of the most common signs of poorly informed but pretentious denier. The assertion that since levels of co2 have been higher in other times, there is no big deal about the current rise.
I actually made a popular video on this topic myself, and drew heavily on one of Alley’s most famous speeches, at the American Geophysical Union in 2009, to make this point in much more detail. See below….

WHAT GOOD IS THE BILLIONS THE COMPANIES HAVE MADE WHEN THE PLANET IS WRECKED?