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2010-06-03

NASA Earth Observatory: Global warming

Global Warming

Throughout its long history, Earth has warmed and cooled time and again. Climate has changed when the planet received more or less sunlight due to subtle shifts in its orbit, as the atmosphere or surface changed, or when the Sun’s energy varied. But in the past century, another force has started to influence Earth’s climate: humanity.

NASA Earth Observatory: Global warming

Till Alla

Red: Hans Iwan Bratt. epost: hibratt@gmail.com.
Användarvillkor per 2018-02-12 Förslag på förbättringar