It helps to conduct heat through the water mantle and into outer space.
We've said it a dozen times on Vault-Co but here it is again from NASA.
CO2 does not provide any significant effect on climate whatsoever even at very high concentrations, unlike the historic lows we are in now. Cosmic radiation increases cloud cover at the same time the Sun goes dormant. This phenomenon, almost certainly somehow connected to our passage through the Oort Cloud, is what sets the clock of the climate over the eons.
This 12,000 year Holocene is at an end. It is more accurately called the Anthropocene because Homo Sapiens can't survive outside it. He's just not tough enough. The historians will record that he could not even get it right at the end of his own reign and was expecting global warming. Saps, the critter that failed at failing.
Dr. Laurence J. Peter said that permanent staff insist on sending that person packing. Five thousand companies tracked over five years and I can summarise the entire book for you so you don't have to read it. Dr. Peter said that the Neanderthals do everything. Anything else is only theatrical or appearances. The Neanderthal secretly carries the entire Sapiens society on his stout back and almost no one ever figures it out until he or she is no longer available.
For this reason, always hire people who have the exact opposite qualities that everyone else looks for if you want to get it right. When I am in charge of hiring I always look for high IQ, socially awkward neurotics with low self-esteem and insomnia. My ability to hire the very best candidates missed by everyone else is uncanny, I have scored big so many times now you have to wonder why the nation just doesn't put me in charge of everything since the meritocracy is the only social organization that works, period.
I have noticed that the already scarcely reliable Wikipedia has shorter entries for the most critical thinkers of the previous century week to week. Somebody is trimming them until they can be eliminated altogether. On the other hand, the Kardashian page just keeps getting bigger.