A hacker got into the email server of a climate research institute which had discussions of various scientists who worked on the IPCC and climate change issues. The email seems to contain material which suggests that the scientists have worked together to prove things which the data is not showing.
We need to wait and see how much of this is true.
Reading through this I found this article which talks about the famous hockey stick graph in Al Gore’s An Inconvenient Truth. The data shows something totally different.