Nearly half a century ago, the US Department of Energy launched a clean energy experiment beneath the University of Minnesota with a simple goal: storing hot water for months at a time in an aquifer more than 100 metres below ground. The idea of the seasonal thermal energy storage was to tuck away excess heat produced in summer, then use it in the winter to warm buildings. Now, 45 years after the first test wells were drilled under the university’s St Paul campus, one of the first large-scale aquifer thermal energy systems in the country is being built less than
Clean air should not be a privilege: how Bogotá is tackling air pollution in its poorest areas
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