For the last 100 years, scientists have been exploring the reason why temperatures are so much warmer in the city compared to the rural areas surrounding them. This phenomenon, called an urban heat island, is a direct result of our activities. Unfortunately, with global warming, this increased heat continues to go up in areas with lots of stone and concrete like parking lots and even in our own backyards. Even though more cities are investing in green spaces and promoting green roof technology, several online sources state that more than 70 per cent of all of the surfaces that we are currently installing in our landscaped spaces are concrete, pavement, stone or pavers. We are turning our own backyards into mini urban heat islands.