RT Journal Article SR Electronic T1 How health care contributes to climate change JF Canadian Medical Association Journal JO CMAJ FD Canadian Medical Association SP E403 OP E404 DO 10.1503/cmaj.109-5722 VO 191 IS 14 A1 Caroline Mercer YR 2019 UL http://www.cmaj.ca/content/191/14/E403.abstract