Your master need some sort of a war and the war against global warming is as good as any other. Read 1984. from the 1984 wiki page:
“The book” explains that the purpose of the unwinnable, perpetual war is to consume human labour and commodities, hence the economy of a superstate cannot support economic equality (a high standard of life) for every citizen. By using up most of the produced objects like boots and rations, the “proles” are kept poor and uneducated so that they will not realize what the government is doing and they will not rebel.
And in 100 years there be far more 100 year olds living.