Well, they're announcing it out loud! The deepest pockets are "backing large-scale geoengineering," a.k.a. "experiments to manipulate the climate on a global scale to avoid catastrophic climate change." They call it mere sulfur dioxide -- the stuff they're thinking about using as "reflective particulates" -- but we know better.
This article from The Guardian (UK) titled "Bill Gates Backs Climate Scientists" reminds us that "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 $4.6 million from Gates to run the Fund for Innovative Climate and Energy Research (FICER). Nearly half FICER's money, which comes directly from Gates' personal funds, has so far been used for their own research, but the rest is disbursed by them to fund the work of other advocates of large-scale interventions. According to statements of financial interests, Keith receives an undisclosed sum from Bill Gates each year, and is the president and majority owner of the geoengineering company Carbon Engineering ... "