I wonder more about heating than cooling. Luddite paranoia perhaps but hot air rises up into space and away. Cold air sinks, where does it go? Outside air is a

I wonder more about heating than cooling. Luddite paranoia perhaps but hot air rises up into space and away. Cold air sinks, where does it go? Outside air is a big heat sink but if entire urban areasn start pumping out MW of cold air in the future will the bottom of hills turn into ice rinks?