Rolling Stone article on this subject.
From the Washington Post:
A draft United Nations climate science report contains dire news about the warming of the planet, suggesting it will likely cross the key marker of 1.5 degrees Celsius, or 2.7 degrees Fahrenheit, of temperature rise in the 2040s, and that this will be exceedingly difficult to avoid.
In a TV interview, EPA Director Scott Pruitt says humans have flourished before in warm periods, and it's "arrogant for us to say that we know what [the ideal surface temperature] should be in 2100." Washington Post story is here.