UNITED NATIONS: The United Nations Secretary-General says the world must dramatically change the way it is fueled to limit future warming to a level scientists call the nearly impossible.

In an exclusive interview with The Associated Press, Antonio Guterres says the alternative would be total disaster.

Guterres is summoning world leaders to the U.N. in September to tell them they've got to change the world in big ways, not small.

He says he will ask leaders to stop subsidizing fossil fuels. He wants countries to build no new coal power plants after 2020. He wants countries to put a price on the use of carbon.

And ultimately he wants to make sure that by 2050 the world is no longer putting more greenhouse gases into the air than nature sucks out.