It is meant to point out that something big must be happening on a global scale for Gates to get involved in spending billions to spray the ENTIRE planet in attempt to block out the sun and stop global warming.
I think he is trying to stop the antarctic icecap from melting and releasing a huge amount of methane gas all at once which could be an ELE, extinction level event. Here is a picture showing the extent of the icecap melting and the methane gas (orange in the picture) being released from the exposed ocean.
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