President's Paris Speech Yesterday President's Paris Press Conference Today See Opposing PARIS CLIMATE CHANGE CHALLENGE: "Endorsed by 161 science and technology experts well qualified in climate science, the challenge was presented as an open letter submitted to UN Secretary General Ban Ki-moon and reported on by prominent media across the world," explained Harris. Most significant among the challenges was for proponents of dangerous anthropogenic climate change theory to substantiate claims that: Recent climate change is unusual in comparison with historical records; Human emissions of carbon dioxide and other 'greenhouse gases' are [...]