Evolution of Earth
The evolution of this planet and its atmosphere gave rise to life, which shaped Earth's subsequent development. Our future lies in interpreting this geologic past and considering what changes--good and bad--may lie ahead
The Evolution of the Earth
The formation of this planet and its atmosphere gave rise to life, which shaped the earth's subsequent development. Our future lies in interpreting this geologic past
The Changing Climate
Global warming should be unmistakable within a decade or two. Prompt emission cuts could slow the buildup of heattrapping gases and limit this risky planetwide experiment
Climate Modeling
Will the "greenhouse effect" bring on another Dust Bowl? Would nuclear war mean nuclear winter? Computer models of the earth's climate yield clues to its future as well as to its checkered past