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Between 1950 and 2020, the average pH of the ocean surface fell from approximately 8.15 to 8.05. [69] Carbon dioxide emissions from human activities are the primary cause of ocean acidification, with atmospheric carbon dioxide (CO 2) levels exceeding 422 ppm (as of 2024). [70] CO 2 from the atmosphere is absorbed by the oceans.
Atmospheric carbon dioxide (CO 2) concentrations from 1958 to 2023. The Keeling Curve is a graph of the annual variation and overall accumulation of carbon dioxide in the Earth's atmosphere based on continuous measurements taken at the Mauna Loa Observatory on the island of Hawaii from 1958 to the present day.
In 2016, the global average temperature was already 1.1°C above pre-industrial levels. [15] According to the review of the scientific literature conducted by the Intergovernmental Panel on Climate Change (IPCC), carbon dioxide is the most important anthropogenic greenhouse gas by warming contribution. [16]
We’ve entered some profoundly unfamiliar planetary territory. Amid a backdrop of U.S. politicians still questioning whether the changing climate is attributable to humans (it is), it's quite ...
Carbon dioxide levels in the air are now the highest they’ve been in more than 4 million years because of the burning of oil coal and gas. The last time the air had similar amounts was during a ...
When carbon dioxide dissolves in water, it forms carbonate and mainly bicarbonate (HCO − 3), which causes ocean acidification as atmospheric CO 2 levels increase. [15] Carbon dioxide is 53% more dense than dry air, but is long lived and thoroughly mixes in the atmosphere.
The UK standards for schools say that carbon dioxide levels of 800 ppm or lower indicate that the room is well-ventilated. [92] Regulations and standards from around the world show that CO 2 levels below 1000 ppm represent good IAQ, between 1000 and 1500 ppm represent moderate IAQ and greater than 1500 ppm represent poor IAQ. [88]
The atmospheric levels of carbon dioxide are the highest they have been in at least 2 million years, [1]: 8 if not 3.2 million years. [ 2 ] : 11 The atmospheric levels of two other major greenhouse gases, methane and nitrous oxide , are the highest they have been in at least the past 800,000 years.