TY  - SER
AU  - Houghton,Richard A.
AU  - Woodwell,George M.
TI  - Global climatic change: evidence suggests that production of carbon dioxide and methane from human activities has already begun to change the climate and that radical steps must be taken to halt any further change 
KW  - OZONE
KW  - IF
ISSN  - 0036-8733
Sources  - Scientific American
Sources  - 260 (4) 1989 : 18-26
ER  -