Summer 2021 is shaping up to be one of the hottest in history, as the effects of climate change are becoming ever clearer. Naturally, that’s led to an increase in global demand for air conditioning, which itself is a major contributor to global warming. It’s a vicious cycle, but there are a number of companies working to make heating and cooling more energy efficient, and get buildings off of fossil fuels for good.  See this video from CNBC.

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