Warming without high CO(sub2)?

Article Abstract:

Pagani and colleagues have used a molecular-isotopic approach to tracing CO(sub2) in glacial-inter-glacial cycles. They have presented evidence for surprisingly low CO(sub2) levels of around 180-290 parts per million by volume in the early to late Miocene. They have concluded that greenhouse warming by high CO(sub2) does not explain Miocene warmth, and have found that short-term CO(sub2) minima coincide with glacial cooling.

Global warming

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A balmy Arctic

Article Abstract:

A testament, Jenkyns et al have produced a new datum from one of the coldest spots on Earth's surface clarifies the nature of extreme warmth in the cretaceous and reveals that the past was radically different from the present. The new geochemical tool of 70 million year old organic material from the Alpra Ridge in Arctic Ocean, Jenkyns et at calculates that the average sea surface temperature was 15 degree C.

Science & research, Arctic, Environmental aspects, Arctic Ocean, Cretaceous period

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