US: The Carbon dioxide (CO2) levels peaked more than 50 per cent higher than pre-industrial levels in May, comparable to levels seen about 4 million years ago, according to scientists. 美国:科学家表示,5月份,二氧化碳(CO2)浓度达到峰值,比工业化前水平高出50%以上,与大约400万年前的水平相当。 Th...
CO2 levels to hit 50-million-year high by 2050doi:10.1016/S0262-4079(17)30658-9SDOSNew ScientistLe Page M 2017. CO2 levels to hit 50-million-year high by 2050. New Scientist 8 April: 9.
The first hornwort pyrenoids appeared ~100 million years ago, a time that coincided with a drastic decline of atmospheric CO2 levels. However, other younger pyrenoid-containing clades originated during periods with higher atmospheric CO2 levels and pyrenoids were apparently lost in hornwort clades ...
The last time CO2 levels were as high as today, ocean waters drowned the lands where big cities like Houston, Miami, and New York City now exist. It’s a time called the Pliocene (上新世) or mid-Pliocene, some 3 million years ago, when sea levels were around 30 feet higher (but po...
Over the last 3 million years (Ma), the Earth has cooled substantially and transitioned from a single-pole glaciation to a stage with major glaciations on both poles. In the past 1 Ma, the period of glacial cycles switched from ~41 thousand years (ky) to ~100 ky (mid-Pleistocene ...
Junium 8 4,5, The emergence of forests on Earth (~385 million years ago, Ma)1 has been linked to an order-of-magnitude decline in atmospheric CO2 levels and global climatic cooling by altering continental weathering processes, but observa- tional constraints on atmospheric CO2 before the ...
(3.3 to 2.3 million years ago). We find that Earth’s climate sensitivity to CO2-based radiative forcing (Earth system sensitivity) was half as strong during the warm Pliocene as during the cold late Pleistocene epoch (0.8 to 0.01 million years ago). We attribute this difference to the ...
Berner RA, Lasaga AC, Garrels RM (1983) The carbonate-silicate geochemical cycle and its effect on atmospheric carbon dioxide over the last 100 million years. Am J Sci 205:641–683 Google Scholar Berner RA, Beerling DJ, Dudley R, Robinson JM, Wildman RA (2003) Phanerozoic atmospheric ox...
Using a new computer simulation,researchers at the Potsdam Institute for Climate Impact Research (PIK), in Germany, found that the last time the earth’s atmosphere had a CO2 concentration as high as today’s was during the Pliocene epoch, the geological period 2.6-5.3 million years ago. CO2...
They raised $3.5 million in funding and focused on the shipping industry. “The beautiful part is that the ship is a natural water pump,” Adkins said, noting that the system requires water to be constantly moving around for the reaction between the various elements to happen, something that...