Suppose you block a percentage of sunlight from reaching the earth. The main reason this is a bad idea is that plantlife on this planet has evolved for a certai

Suppose you block a percentage of sunlight from reaching the earth. The main reason this is a bad idea is that plantlife on this planet has evolved for a certain amount of light. Yeah, it'll cut down on melting. But what that do to ecologies all over the world? Yes, volcanoes can have this effect. But volcanoes of that scale don't happen very often.