Using this handy dandy graph, I estimate that by the time climate change forces a response we will need to reverse 2° Celsius of heating.
The method for temperature control is described in here - a sunlight blocking satellite.
What percent of the sunlight destined for Earth needs to be reflected/redirected?
The question above presupposes 1%. But where I live there is a 14° variance in temperature which happens over 8 hours (1.75° per hour). The satellite would block light 24 hours per day so by my calculations we could cool the Earth 2°C in 5 days.
1% cooling x 1.75° x 24 hours x 5 days = 2.1°
I assume my math is wrong. But assuming we want to cool the earth over 20 years, what percent of sunlight actually needs to be reflected?