Back in 1991, Wayne Esaias set up beehives in his backyard. He weighed the hives every day, determining when the bees had finished collecting nectar for the year. But it wasn't until early 2006 that he decided to plot out the data. That's when he saw an unmistakable curve towards earlier and earlier plant blooming, and realized his data could help understand climate change. Also on the show: a riverkeeper fights water polluters in the media and in the courtroom.