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...
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 ...
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.
It is possible that clades of zooxanthellae not seen today may have occurred in past intervals of high temperature, the most recent being the temperature peaks of the Pliocene (5–2.6 million years ago), especially if temperature increase occurred sufficiently slowly for evolutionary adaptation to ...
Carbon dioxide,measuredin Hawaii at the Mauna Loa observatory, reached 420 parts per million in May. This is a 50 percent increase above pre-industrial levels, the highest in human history — and the highest since the Pliocene Climatic Optimum over 4 million year...
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 ...
Atmospheric CO2is thought to play a fundamental role in Earth’s climate regulation. Yet, for much of Earth’s geological past, atmospheric CO2has been poorly constrained, hindering our understanding of transitions between cool and warm climates. Beginning ~370 million years ago in the Late Devonia...
Average annual atmospheric levels of carbon dioxide (CO₂) reached a record high of 424.61 parts per million (ppm) in 2024. Monthly atmospheric CO₂ concentrations peaked that year in June, at 426.91 ppm. Human activities have caused CO₂ concentrations to soar Annual CO₂ concentrations...
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...