<img src="https://www.washingtonpost.com/wp-apps/imrs.php?src=https://arc-anglerfish-washpost-prod-washpost.s3.amazonaws.com/public/C2MFJXBWHFE75BXIYAKBMCIMDI.jpg&w=1024" /><br>A technology called geosolar engineering is a cheap and fast way to fight global warming. But it could also spark conflict.