The primary cause of Climate change is increased levels of CO2 in the air. I personally think they can identify the source of the increased levels of Co2 but that's a different discussion.
So the solution is to reduce CO2 levels in the air.
I read something the other day about Genghis Khan the other day that had a solution. Genghis Khan killed some ridicously huge numer of people - so many that a lot of farmland when back to being forest, changing the CO2 levels.
So the solution is to use plants to scrub the air of CO2. We could either plant more forests or.......
Bioengineer a plant that was small but really good at removing CO2 from the air. We'd have to be really careful because if the plant got lose and proliferated, it could bring CO2 levels down too low causing the plant to cool down. Oh, and make it so the plant could easily be converted to alcohol for biofuels.
Problem solved - where do I get my Nobel Prize (not the Peace Prize, the one for actually doing something).
Better yet, I just saved the planet - I want a statue.