'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:173
hansen said that nasa was 99% confident that the warming was caused by the accumulation of greenhouse gases in the atmosphere and not a random fluctuation.