Because climatechangeorglobalwarming can neither be proved or disproved using the scientific method because we are living and taking measurements within the only experiment there is or ever can be.
D. level climate scientists that work at Columbia University's Earth Institute and even if you do not understand the physics of climatechangeor the computer models predicting globalwarming, common sense alone might lead you to think that human beings and their machines are making the planet warmer.
He tried hard to be neutral and avoided any judgment on the science underlying climatechange predictions or on possible policies to counteract globalwarming.
Efficiency is the most important response to the many challenges facing the planet during the next century and beyond, including: globalwarmingor any other form of climatechange.