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Effects of volcanoes lasts a couple of years, as your graph shows.
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So I wonder if NASA is right that the volcanoes that have been erupting has indeed slowed the warming.
That isn't from NASA; it's from one study. It might be true, but it doesn't appear that it's accepted. Science research in progress often has differing ideas. NASA is just posting recent scientific research.
I hate politics. Just So nice to see NASA has admitted global cooling since 2000.
I don't think it's saying the globe has cooled has 0.05 to 0.12°C, they're saying the total effect of volcanic activity by itself has been to cause a cooling of 0.05 to 0.12°C. The actual temperature change is from volcanic effects combined with many other effects.
"NASA found a net cooling in the northern hemisphere due to industrial activity
Fossil fuel burning gives of aerosols which reflect sunlight
While the findings did not dispute the effects of carbon dioxide on global warming, they found aerosols - also given off by burning fossil fuels - actually cool the local environment, at least temporarily.
The research was carried out to see if current climate change models for calculating future temperatures were taking into account all factors and were accurate."
I don't think it's saying the globe has cooled has 0.05 to 0.12°C, they're saying the total effect of volcanic activity by itself has been to cause a cooling of 0.05 to 0.12°C. The actual temperature change is from volcanic effects combined with many other effects.
That's correct.
"The small particles, or aerosols, were spewed high into the atmosphere and scattered sunlight back into space, preventing the global average temperature from rising from 0.05°C to 0.12°C. That cooling effect represents between 25% and 50% of the expected temperature rise during that period because of rising atmospheric concentrations of greenhouse gases.."
"NASA found a net cooling in the northern hemisphere due to industrial activity
Fossil fuel burning gives of aerosols which reflect sunlight
While the findings did not dispute the effects of carbon dioxide on global warming, they found aerosols - also given off by burning fossil fuels - actually cool the local environment, at least temporarily.
The research was carried out to see if current climate change models for calculating future temperatures were taking into account all factors and were accurate."
There are countless feedback mechanisms that contribute to climate change. Some are negative (that is, as X increases, Y decreases) and some are positive (as X increases, Y also increases). The largest uncertainties that exist with respect to anthropogenic radiative forcing are aerosols. Aerosols are currently thought of as a negative feedback mechanism. Aerosols limit surface heating by preventing incoming solar radiation from reaching the surface.
Even with the quantified uncertainty of aerosol induced cooling, the sum of all sources of anthropogenic radiative forcing is still positive.
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