Carbon dioxide levels (CO2 levels) now above 400 ppm

CO2 levels now cross 400 ppm threshold and reach the highest point in millions of years. The increase of carbon dioxide, methane, and nitrous oxide is fueling climate change and enhancing green house effect.

Carbon dioxide or CO2 levels reach the highest point

Carbon dioxide, as the gas scientists say is most responsible for global warming reached a significant symbolic milestone in our nature atmosphere this month, the Scripps Institution of Oceanography said.

For the first time, daily and weekly values of carbon dioxide in our planet's atmosphere have remained above 400 parts per million

The increase in gases such as carbon dioxide, methane and nitrous oxide is fueling climate change and making "the planet more dangerous and inhospitable for future generations," the World Meteorological Organization has said.

Increasing amounts of carbon dioxide and other gases are enhancing the planet's natural "greenhouse effect."

Carbon dioxide CO2 levels above 400 ppm - reach highest point

 The first time in millions years CO2 above 400 ppm

Based on paleoclimatic evidence, the last time CO2 levels reached 400 ppm was millions of years ago, according to the journal Nature Geoscience. A 2009 report in the journal found evidence of carbon dioxide levels of 365 ppm to 415 ppm roughly 4.5 million years ago.

Carbon dioxide is invisible, odorless and colorless, yet it's responsible for 63% of the warming attributable to all greenhouse gases, according to NOAA's Earth System Research Laboratory in Boulder, Colo.

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