How Earth’s Climate Changes Naturally (and Why Things Are Different Now)
The heading above is from a long but emptyheaded article that catalogs in a handwaving way the various influences on earth's climate.
One might expect that a consideration of all the natural influences would inspire doubt about the anthropogenic global warming thesis. One would think that a signal emanating from human deeds would be hard to distinguish from all the other influences at work.
No such luck. The article is straight warmism. The idea seems to be to create an air of profundity in its claims. By discussing all the other climate influences and still showing anthropogenic global warming at work the article reassures us that a full scholarly exercise has been undertaken before concluding that anthropogenic global warming exists. All "t"s have been crossed and all "i"s have been dotted.
But the article in fact gives no evidence at all for anthropogenic global warming. The most it offers is a link to another paper which in turn relies on the IPCC reports. So it is all just the same old same old. It's a long article but there's no reason to spend any time on it.
Earth’s climate has fluctuated through deep time, pushed by these 10 different causes. Here’s how each compares with modern climate change. Orbital wobbles, plate tectonics, evolutionary changes and other factors have sent the planet in and out of ice ages.
Earth has been a snowball and a hothouse at different times in its past. So if the climate changed before humans, how can we be sure we’re responsible for the dramatic warming that’s happening today?
In part it’s because we can clearly show the causal link between carbon dioxide emissions from human activity and the 1.28 degree Celsius (and rising) global temperature increase since preindustrial times. Carbon dioxide molecules absorb infrared radiation, so with more of them in the atmosphere, they trap more of the heat radiating off the planet’s surface below.
But paleoclimatologists have also made great strides in understanding the processes that drove climate change in Earth’s past. Here’s a primer on 10 ways climate varies naturally, and how each compares with what’s happening now.