Believe it or not, air pollution is the world’s single largest health risk, causing seven million premature deaths every year. Green City Solutions however have harnessed the power of nature to create the CityTree, which has the same air-purifying effect as 275 trees in the space of one. The CityTree stemmed from the discovery that moss cultures capture more pollutants than any other plant, plus it can even sustain itself through solar panels. Let’s hope they catch on!