Curious About the "Peace" Prize:

What are the official criteria used to determine the recipient of the Nobel Peace Prize? I couldn't find any information about this on the Nobel website, and all I can get from Wikipedia is that "according to Nobel's will, the Peace Prize should be awarded 'to the person who shall have done the most or the best work for fraternity between the nations, for the abolition or reduction of standing armies and for the holding and promotion of peace congresses.'"

Obviously, I'm wondering about what strikes me as the rather indirect relationship between raising the world's consciousness about climate change and promoting peace.