You burn calories through MOVEMENT, not sweating. While your body may sweat more trying to get rid of excess heat in warmer weather, you aren't moving any more, so you don't burn any more calories.
About the only time temperature makes a difference is when you are cold enough to start shivering (which is the body trying to generate more heat through involuntary muscle movement).
The reasonable man adapts himself to the world; the unreasonable one persists in trying to adapt the world to himself. Therefore all progress depends on the unreasonable man.
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