Man-made catastrophic climate change is a hoax, certainly. That document is a must read for conspiracy theorists. Also I reccommend a really good book about how the hoax was rumbled by a Canadian statistic specialist:

The Hockey Stick Illusion

That's a digital copy of the book on Libgen. It's an excellent read in that it explains a complex situation in laymans terms and reads like a detective novel, except it's real, the detective being the Canadian stats guy Stephen MacIntyre and the criminal being Michael Mann, Gore-ite and Climate Alarmist extraordinaire.