Oreskes , DDT : 11 scientists wrote letter to reiterate global warming findings . Authors : On the contrary , they 've been repeatedly vindicated in their work on environmental change . Al Gore came after attack on scientist whose work shows human impact on climate . They say attacks similar to those aimed at science on Conway , first -hand smoke , acid rain . Common to all , they say , is link to think tanks promoting free markets , opposing regulations .
Oreskes , DDT : 11 scientists wrote letter to reiterate global warming findings . Authors : Al Gore came after attack on scientist whose work shows human impact on climate . They say attacks similar to those aimed at science on Conway , first -hand smoke , acid rain . Common to all , they say , is link to think tanks promoting free markets , opposing regulations .