Whenever someone raises "climate change", I try to educate them on the following facts:
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carbon dioxide is 0.4% of the atmosphere
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Canada was under an ice sheet 12,000 years ago, so there must have obviously been a massive warming that occurred, without humans.
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how do you determine the atmosphere's "temperature" today? how do you determine it from years ago? are those two different methods going to give you the same data? taking T data from places like airports, that have lots of cement and thermal radiation, might skew the data…