Vermont has become the first U.S. state to ban the natural gas drilling practice of hydraulic fracturing, or fracking. On Wednesday, Vermont Gov. Peter Shumlin signed the measure into law at a ceremony attended by environmentalists and a group of high school students who pushed for the ban.

Gov. Peter Shumlin: “This bill will ensure that we do not inject chemicals into groundwater in a desperate pursuit for energy. It’s a big moment. I hope other states will follow us. The science on fracking is uncertain at best. Let the other states be the guinea pigs. Let the Green Mountain State preserve its clean water, its lakes, its rivers and its quality of life.”