The idea behind offsets is that you pay someone else to reduce emissions on your behalf when they can make the reductions more cheaply than you can. The leading offset method use to fight climate chaos is the Clean Development Mechanism. This is an extremely controversial topic, with many (including me) contending it does not work. The BBC has an excellent radio broadcast covering both sides of the controversy. The broadcaster concludes that offsets don’t make sense. But he gives leading intelligent pro-CDM experts plenty of time to make their case. It is an example of a program that is, while not the least bit objective, still being fair.