This is a great sight. NASA Global Climate Change. There are charts of long term trends from 1880's to the present.
Like this one:
This is annual temperature changes since the beginning of the industrial revolution (i.e. 1880's). The sight is filled with incredible science. For example, NASA is able through a gravity detecting satellite to detect the mass of the entire antarctic continent to be able to trend changes in the total mass of ice. The antarctic continent is losing 24 cubic miles of ice per year.The technology used to gather data and make observations is just incredible.
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