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Over the last 150 years, CO2 concentrations have increased from around 300 ppm to around 400 ppm - mostly in the last 70 years or so.

Current scientific thinking is that anything over 350 ppm is likely to have unwanted consequences.

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9y ago
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10y ago

CO2 levels were about 260-280 ppm immediately before industrial emissions began and did not vary much from this level during the preceding 10,000 years.

The concentration of carbon dioxide (CO2) in Earth's atmosphere has reached 400 ppm (parts per million) as of 2013.

((400-280)/280)*100 = 42.86

Thus there has been a 42.86% increase in the levels of CO2 in Earth's atmosphere in recent years.

See the link below for a simple graph.

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10y ago

Carbon dioxide emissions over the past 250 years have risen. In 1750, carbon levels were 280 ppm (parts per million) or 0.028%. Now, in 2013, levels are over 400 ppm (parts per million) or 0.04%.

This is a rise of almost 43%.

See the link below for a simple graph.

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10y ago

It has increased by almost 43% in the past 200 years, from 280 ppm (parts per million) or 0.028% in 1700 to 400 ppm or 0.04% in 2014.

See the simple graphs at the link below.

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Q: How much have the atmospheric carbon dioxide concentrations increased in recent years?
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