'on june 23, 1988, nasa scientist james hansen testified before the house of representatives that there was a strong "cause and effect relationship" between observed temperatures and human emissions into the atmosphere.
'on june 23, 1988, nasa scientist james hansen testified before the house of representatives that there was a strong "cause and effect relationship" between observed temperatures and human emissions into the atmosphere.
james hansen:639
...dr. james e. hansen of the national aeronautics and space administration told a congressional committee that it was 99 percent certain that the warming trend was not a natural variation but was caused by a buildup of carbon dioxide and other artificial gases in the atmosphere.