can purchase copies and that posted the link in the chat and on behalf of the harvard library >> steven coonen, former undersecretary for science at the department of energy during the obama administration, argued that climate science is not settled. here's a portion of that conversation. >> about 2005 when i joined up until the time i left the government in 2012, i was working to prevent and demonstrate emissions like technologies of different kinds. but in 2013 i was asked by the american physical society, which is the professional society that represents 50,000 physicists, to bring a refresh of the statement on climate change. in 2007 they had issued a statement to great controversy among the membership because of using the word incontrovertible. and if you're a physicist, you know that that is a red flag. and so in 2013 it was time to look again at the statement. and i thought like many professions and societies who issue climate statements, the u.n. says, i thought, heck, we're physicists, we should have a deeper look at the issue. and so i convened a workshop. , at that time it was five