Green Infrastructure Could Save Cities Billions

Compared to canvas grocery bags or CFL light bulbs or even solar panels, larger "green infrastructure" projects such as roof gardens or permeable streets can be hugely expensive. It turns out, however, that they're actually not that expensive when compared to the costs of building more traditional infrastructure, and can even save money. According to a new study, governments are wasting billions of dollars a year by not going green.

Looking at 479 case studies of green infrastructure projects around the U.S., the report finds that the majority of projects turned out to be just as affordable or even more so than traditional "grey" infrastructure. About a quarter of projects raised costs, 31 percent, kept costs the same and more than 44 percent actually brought costs down.