Its annual increase of 2.3 ppm marked the 12th consecutive year with an increase greater than two ppm — a streak caused by "historically large fossil fuel CO2 emissions in the 2010s and 2020s," the report said. Just under half of CO2 emissions remain in the atmosphere, while the rest ar...
Although it was reported that CO2 reached417 ppm in 2020, and then420 ppm for the first time earlier this year, those values came from just one site — atop Mauna Loa in Hawaii — and they represented the maximum concentrations recorded at the peak of the yearl...
Fernández-Martínez等人[325]进一步发现在1995~2014年间, 大气CO2浓度升高使全球陆地NEP增加3.1~8.1 Pg C/100 ppm. 最近的一项研究认为, 1982~2015年间CO2施肥效应对全球大部分陆地生态系统总初级生产力(gross primary productivity, GPP)的促进作用呈下降趋势, 意味着陆地碳汇对气候系统的负反馈效应正在...
Fernández-Martínez等人[325]进一步发现在1995~2014年间, 大气CO2浓度升高使全球陆地NEP增加3.1~8.1 Pg C/100 ppm. 最近的一项研究认为, 1982~2015年间CO2施肥效应对全球大部分陆地生态系统总初级生产力(gross primary productivity, GPP)的促进作用呈下降趋势, 意味着陆地碳汇对气候系统的负反馈效应正在...
Having said all this I remain cautious on emissions. We have those who are hysterical about all the climate change we have already caused. If it is the case that going from 260 to 400 ppm CO2 is causing extensive climate change today then we really are in trouble. And the hysterical comm...
Estimates based on the Intergovernmental Panel on Climate Change (IPCC) "business-as-usual" emission scenarios suggest that atmospheric CO2 levels could approach 800 ppm near the end of the century. Corresponding biogeochemical models for the ocean indicate that surface water pH will drop from a ...
For example, Vancouver’s climate plans (2020, 2021) repeatedly estimate there is at least a ~$100 M financing gap constraining implementation. Critical choices are sometimes kicked down the road e.g., London’s plan (updated in 2022) when the choice of whether to build decarbonized heat...
Global warming is accelerating – the facts • Since the Industrial Revolution, which introduced machinery powered by coal and gas, atmospheric CO2 concentration has increased by about 40%, to above 400 parts per million (ppm).11 Current CO2 levels are 100 ppm higher than at any time in ...
In the big picture, 400 ppm is a low-to-middling concentration of CO2 for the planet Earth. Some 500 million years ago, when the number of living things in the oceans exploded and creatures first stepped on land, the ancient atmosphere happened to be rich with about 7,000 ppm of carbon...