Taking to social media to complain about hot subway rides? You're not alone, study says

A new study published in the journal Nature Cities shows that as temperatures rise above ground, the number of subway riders reporting uncomfortable heat underground increases. Researchers at Northwestern University analyzed thousands of social media posts for keywords related to being hot in the underground subways of Boston, London and New York. This could become increasingly true as climate change, driven by the burning of fossil fuels, makes the planet hotter. Researchers hope this work will influence heat mitigation efforts for commuters using underground infrastructure.