Children are the future, or so they say. Environmentalists are now using kids to “school” lawmakers on the science behind man-made global warming. On Tuesday, six high schoolers from states “hard hit” by global warming will go to Capitol Hill to try and convince lawmakers skeptical of man-made global warming that it’s real and it’s impacting peoples’ lives today. “What I know about climate change is that it’s real, it’s man-made and there’s scientific evidence to back it up,” Helen Winston, a high schooler from Nebraska, said in a video produced by the liberal campaign group Avaaz.