. >> scientists in greenland getting excited about a rock they say could be a key component in stopping climate change. >>> students rising above advisers and scholars work closely together. we are meet ever wonder how san francisco became the greenest big city in america? just ask the employee owners of recology. we built the recycling system from the ground up, helping san francisco become the first city in the country to have a universal recycling and composting program for residents and businesses. but it all starts with you. s ep maka differen toge. >>> welcome back. a live look at wall street on this friday afternoon, dow is up more than 360 points. president biden and former president obama joining forces for the environment. obama's team says he will travel next month for a un summit. he's expected to talk about progress in the last years and highlight leadership of young people. he along with 13 cabinet members and senior officials will be in attendance. >>> miners and investors in greenland excited about rocks they found similar to prop back from apollo missions to the moon. w