How is global warming (aka climate change) measured? What techniques and instruments are used? Where are the places on earth that are measured? Where does the data come from?
You might at first think a quick Google search would bring up at least a few, if not tons, of pages with the answer, or at least a partial answer. But go ahead...try it. I didn't dig for a long time, but I was disappointed in the results I got. I even tried ask.com too. Really, try it, and tell me what you found, or didn't find.
I still don't know the answer.
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