the joy of creation. FULL POST (CNN) - Nalini Nadkarni is a pioneer in tree canopy research and co-founder of the Sustainability in Prisons Project, which aims to teach inmates about ecology. Watch a 30-minute profile of  on Sunday at 2 p.m. ET on CNN's "The Next List." Here's a primer on why she is fascinating enough to make The Next List. Why you've heard of her : You probably haven't. Unless you're a tree climbing scientist or an inmate in Washington state (more on that soon). Oh - or you may have seen "Heroes of the High Frontiers," an Emmy-winning National Geographic film. She's in that. Or maybe you were one of the lucky few to get your hands on the " Tree Top Barbie Doll " she developed. FULL POST New York (CNN) - In crowded cities like Manhattan where most people work and live in high-rise buildings, there is a desire for green space and fresh air. Rather than create another park above the ground, two designers have proposed the LowLine , what they call "the world's first underground park." The project, founded by Dan Barasch and James Ramsey, would take the old Essex Street Trolley Terminal located on Manhattan's Lower East Side and convert it into a subterranean playground, complete with sunlight. After a friend and former MTA employee told Barasch and Ramsey about the amount of unused space underground, they decided to build something that would use the free space in the city, rather than