Shadowing the earth from Lagrange Point L_1: New insights into an extraterrestrial method to compensate global warming

摘要

Already in 1989 the author tried to answer the question: "Can the climate be engineered?" by proposing the deployment of a large screen - a parasol - in the microgravity environment of the Lagrange Point L_1. To reduce the man made greenhouse gas warming effect of about 2.5-3℃ a screen area of half of Brazil (= 4.5 Million km~2) would be necessary. L_1 lies permanently 1% of the distance from earth to sun (i. e. 1.5 Million km corresponding to about four times the distance to the moon).