If you look at it ecologically, deforestation is high on the list of things which bring devastation. You cut down trees to build homes, for fuel, and you end up with no trees left, and you have to move on. If you take the earth as a whole, eventually there's nowhere to move on to.
I try to make myself walk around a bit, but I probably think about it more than I actually do it. Years ago, I did think about joining a gym.
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