Four teen members of FloodGate Team. From the left: George Cheng, Larry Myers (team supervisor), Reichen Schaller, Shubhan Bhattacharya, and Sumedh Kotrannavar. Photo: The Earth Prize.FloodFate TeamFour teens won $50,000 and first place at this year's Earth Prize competition.The Earth Prize is the world's largest environmental competition for teens.The winners hope their invention will one day help hundreds of millions worldwide at risk of floods.George Cheng thinks a lot about flooding.In his home state North Carolina, hurricanes and tropical storms cause annual flooding that damages homes, farms, and crop fields.