Creating this sunshade in space was estimated to cost in excess of US $5 trillion, thus leading Professor Angel to conclude that (t) he sunshade is no substitute for developing renewable energy, the only permanent solution.
Creating this sunshade in space was estimated to cost in excess of US $5 trillion with an estimated lifetime of 50 years. Thus leading Professor Angel to conclude that (t) he sunshade is no substitute for developing renewable energy, the only permanent solution.