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.
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 ...
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...
that interglacial MS levels during the early Pleistocene (99 ± 28) are generally lower than those during the last 800 ky (154 ± 28), and most of the MS values (78 ± 11) of our 1.7–1.5 Ma samples fall below the MS range (99–227) over the last 800 ky....
it passed 400 parts per million this January, the earliest in the year it has exceeded thisbenchmark. ⑤Even if emissions stay flat, the world remains on course towards a temperature rise of around 3°C by 2100, compared with...
Using ice cores drilled in Greenland and Antarctica, scientists havea pretty good recordof how the composition of Earth’s atmosphere has fluctuated over the last 800,000 years. That’s why scientists know carbon dioxide levels are higher than they’ve ever been in that amount of time. ...
“We will soon be living with globally averaged CO2 levels above 400 parts per million as a permanent reality. We can’t see CO2. It is an invisible threat, but a very real one.” “It means hotter global temperatures, more extreme weather events like heatwaves and floods, melting ...
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 ...
The last time carbon dioxide levels were this high, Greenland was mostly green, sea levels were up to 20 meters higher and trees grew on Antarctica, according to scientists who warned this week that there is more CO2 in our atmosphere today than in the past three million years. Using a n...