He estimated that this would cost around US $10 billion .
According to Benford , this lens would diffuse the light from the Sun and reduce the solar energy reaching the Earth by approximately 0.5 % to 1 % .
Benford estimated that this would cost around US $10 billion .
According to Benford , this lens would diffuse the light from the Sun and reduce the solar energy reaching the Earth by approximately 0.5 % to 1 % .