"Professors David Keith, of Harvard University, and Ken Caldeira of Stanford, are the world's two leading advocates of major research into geoengineering the upper atmosphere to provide earth with a reflective shield. They have so far received over $4.6m from Gates to run the Fund for Innovative Climate and Energy Research (Ficer)." http://www.guardian.co.uk/envi­ronment/2012/feb/06/bill-gates­-climate-scientists-geoenginee­ring