Authors:

I believe the ability to measure, with precision, the degree of human activity's impact on the climate is subject to more debate on whether the climate is changing or whether human activity contributes to it.

"Scott Pruitt Will Make America Great Again — For Polluters" by Bill Moyers, www.huffingtonpost.com. February 1, 2017.
I believe the ability to measure, with precision, the degree of human activity's impact on the climate is subject to more debate on whether the climate is changing or whether human activity contributes to it.