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- United Kingdom
There is overwhelming evidence that there is climate change and that there is global warming, but can someone direct me to facts on to how much human activities are contributing to this?
According to EDL energy, which is one of the first ones that came up in google, this is the case..
Though natural amounts of carbon dioxide have varied from 180 to 300 parts per million (ppm), today’s levels are around400 ppm. That’s 40% more than the highest natural levels over the past 800,000 years.
We also can tell that the additional carbon dioxide in the atmosphere comes mainly from coal and oil because the chemical composition of the carbon dioxide contains a unique fingerprint.
I'd be out of my depth giving much of an explanation but scientists can analyse CO2 by it's Isotopes.... essentially all CO2 is not the same, so they can at least determine how much CO2 may or may not have been generated by burning fossil fuels by looking for Carbon 14 (or lack of).