Santer was later vindicated -- all the co-authors testified he had made no unauthorized changes . Oreskes , Conway : Climate scientists write letter to reiterate global warming findings . Authors : Letter came after attack on scientist whose work shows human impact on climate . They describe attacks similar to those aimed at scientists on DDT , second - hand smoke , acid rain . Common to all , they say , is link to think tanks promoting free markets , and regulations .
Oreskes , Conway : Climate scientists write letter to reiterate global warming findings . Authors : Letter came after attack on scientist whose work shows human impact on climate . They describe attacks similar to those aimed at scientists on DDT , second - hand smoke , acid rain . Common to all , they say , is link to think tanks promoting free markets , and regulations .