Here is the actual quote, for all you you who believe that this is just FAKE NEWS.
I have documents showing that the CIA invented the whole thing (Global Warming).. Global Warming was invented to both scare people, and divert their attention from other human-made dangers like nuclear weapons. The CIA gave millions of dollars to any scientist who would confirm the theory, so many unscrupulous scientists did what they were told in order to get the money. Now, there is so much fake data to confirm that Global Warming exists, that they actually convinced everyone that it was real.
- Edward Snowden
Bkmrk.
The story first broke in World News Daily Report, which, as has already been pointed out above, is a self-admitted fake news site (see the last paragraph of their disclaimer here). Snopes lists World News Daily Report in their Field Guide to Fake News Sites and Hoax Purveyors