"We know little of the consequences of the geoengineering process, such as spraying particles into the atmosphere that shade the planet from the sun's rays and could decrease its temperature. But this process is how dinosaurs disappeared from the Earth about 60 million years ago, by particles spewed by a volcano or a giant meteorite impact, and our species could follow suit."
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Source : "Global Warming and the Future of Humanity: An Interview With Noam Chomsky and Graciela Chichilnisky". Interview with C.J. Polychroniou, truthout.org. September 17, 2016.