John Kerry actually said...
Well, I base my judgment on the science. I am not a scientist but I have read as much as I can, studied it, worked with a lot of people, and my judgment is that if the scientists are telling us that you have 12 years within which to try to prevent the 0.5 additional degrees of warming, to bring us to 1.5, we want to try to avoid it.
Context
Kerry emphasizes the urgency of addressing climate change based on scientific consensus.
04/08/2019