Thermal Waste May Be the Next Thing Heating Our Cities
9th March 2014
Cities are polluting the air, ground, and water around them with heat. Roads and rooftops absorb sunlight, and swapping trees for pavement removes shade. Add all these factors together, and you get something called an “urban heat island,” an air temperature increase of up to 22 degrees Fahrenheit as you get closer to a large city. While the average human is more likely to feel this in the air, these changes also create a well of heat below the ground — and that heat, ironically, can be used as renewable energy even as it changes the ecosystem. Now, thanks to a study from Germany’s Karlsruhe Institute of Technology, we know just where most of it’s coming from, and how it could be better harnessed to replace traditional heaters and air conditioners.