It's helpful to recognize that we're not the first organism to risk undermining the conditions that made us successful by altering the gas mixture in the atmosphere, and that 400 million years of ice is the sort of consequence that we're playing with.
It's helpful to recognize that we're not the first organism to risk undermining the conditions that made us successful by altering the gas mixture in the atmosphere, and that 400 million years of ice is the sort of consequence that we're playing with.