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<blockquote data-quote="roadrunner2012" data-source="post: 1276166" data-attributes="member: 40736">Does it? It would seem to indicate that temperatures are rising at an unprecedented rate. Science, you know.<a href="http://www.washingtonpost.com/blogs/capital-weather-gang/wp/2013/05/10/atmospheric-carbon-dioxide-concentration-400-parts-per-million/" target="_blank">http://www.washingtonpost.com/blogs/capital-weather-gang/wp/2013/05/10/atmospheric-carbon-dioxide-concentration-400-parts-per-million/</a>It’s possible the current CO2 levels haven’t been matched in millions of years. <a href="http://keelingcurve.ucsd.edu/what-does-400-ppm-look-like/" target="_blank"> Scripps Institution of Oceanography estimates</a> the last time the concentration was at least 400 ppm occurred 5 to 3 million years ago, during the Pliocene Epoch.&nbsp;Carbon dioxide is a heat trapping greenhouse gas and its inexorable rise in recent history coupled with an increase in the Earth’s temperature raise concerns about human interference with the climate system and where temperatures and sea levels may be headed.&nbsp;During the Pliocene Epoch, temperatures were 5-7 degrees friend warmer than today and sea levels were many feet higher, <a href="http://keelingcurve.ucsd.edu/what-does-400-ppm-look-like/" target="_blank">Scripps says</a>.</blockquote>

[QUOTE="roadrunner2012, post: 1276166, member: 40736"] Does it? It would seem to indicate that temperatures are rising at an unprecedented rate. Science, you know. [url]http://www.washingtonpost.com/blogs/capital-weather-gang/wp/2013/05/10/atmospheric-carbon-dioxide-concentration-400-parts-per-million/[/url] [I]It’s possible the current CO2 levels haven’t been matched in millions of years. [URL='http://keelingcurve.ucsd.edu/what-does-400-ppm-look-like/'] Scripps Institution of Oceanography estimates[/URL] the last time the concentration was at least 400 ppm occurred 5 to 3 million years ago, during the Pliocene Epoch. Carbon dioxide is a heat trapping greenhouse gas and its inexorable rise in recent history coupled with an increase in the Earth’s temperature raise concerns about human interference with the climate system and where temperatures and sea levels may be headed.[/I] [B][I] [/I][/B] [I][B]During the Pliocene Epoch, temperatures were 5-7 degrees friend warmer than today and sea levels were many feet higher[/B], [URL='http://keelingcurve.ucsd.edu/what-does-400-ppm-look-like/']Scripps says[/URL].[/I] [/QUOTE]

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