The earth is kinda big. The sun strikes over 49,000,000 square miles at any given moment. A solid surface shade blocking 1% would need to be nearly half a milli

The earth is kinda big. The sun strikes over 49,000,000 square miles at any given moment. A solid surface shade blocking 1% would need to be nearly half a million square miles if we could hold it in place like at lagrange 1. If we could launch a fuel that burns into a gas that can effectively block/reflect light that reduces the mass to about 250 sq. miles of fuel times whatever is the necessary density of the gas cloud.