Why spend $45 trillion when these guys can allegedly solve the alleged problem for less than a penny on the dollar?

Fix For Global Warming? Scientists Propose Covering Deserts With Reflective Sheeting

The team's calculations suggest that covering an area of a little more than 60,000 square kilometres with reflective sheet, at a cost of some $280 billion, would be adequate to offset the heat balance and lead to a net cooling without any need to reduce atmospheric carbon dioxide. However, they caution that it would be necessary to control the area covered very carefully to prevent overcooling and to continue with efforts to reduce our reliance on fossil fuels.