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It's also only 21 years of data, and we have been burning FF in quantity for 150 years.
Go ask some climate scientists for their datasets! I bet it would be cool to look at(as well as being HUGE)!
Really only the last 50 or 60 years. Before that the consumption of fossil fuels was relatively insignificant.
Coal counts as fossil fuel and was used for the industrial revolution since the 1800's.
http://en.wikipedia.org/wiki/History_of_coal_mining
They have burnt "sea coal" in Great Britain since medieval times. However with a small and rural population, I doubt if we got to 10% of todays consumption before the early part of the last century.
The key is the 'tipping point'.
At what point did our CO2 emissions increase past the ability of the natural environment to sequester them out of the atmosphere?
This is complicated by the fact that the absorption of the oceans etc. increased as CO2 concentrations increased, thus partially shielding us from the consequences of our actions.
The latest data suggests the planet is no longer doing so. Co2 concentrations have abruptly shifted by 3ppm per annum, whereas previously the rise was 1.9ppm