Greenhouse gases 'warmed Earth billions of years ago'

Full story: Earth Times

Greenhouses gases are not only a modern phenomenon, they originally warmed temperatures around three billion years ago, say American scientists.

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LessHypeMoreFact Toronto, Canada	Reply » \| Report Abuse \| Judge it! \| #1 Mar 29, 2012 Judged: 1 1 1 Greenhouse gasses have been here most of the time. Only in the year leading to the 'snowball earth' did they pretty much disappear.
lost_survivor Since: Mar 12 76 Location hidden	Reply » \| Report Abuse \| Judge it! \| #2 Mar 29, 2012 Judged: 2 1 1 green house gasses did in fact exist for a long while..though due to fuels and gases from our not too eco friendly cars and factories,the gasses have come back stronger than then.
Earthling-1 “Happy, warm and comfortable” Since: Oct 10 20,385 Mountain hideaway, SE Spain	Reply » \| Report Abuse \| Judge it! \| #3 Mar 29, 2012 Judged: 3 2 1 NobodyYouEverWantToKnow, alias: LessFactMoreHype wrote: Greenhouse gasses have been here most of the time. Gases, Mr Undoubtably Spelt Fourty.
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