"The time required for the removal of... [[w:Greenhouse gases|[greenhouse] gases]] from the atmosphere by natural processes is... uncertain: current estimates are several centuries. The uncertainties... [have] led to calls for... restrictions on the generation of greenhouse gases. ...The existence of a possible technical solution could... have a major short-term impact in influencing short term consumption restrictions, even if the solution could not be implemented until the next century."
January 1, 1970
https://en.wikiquote.org/wiki/Space_sunshade