The fate of the world's tropical forests is a contentious issue as the U.S. debates a cap on greenhouse gas emissions. American companies want the ability to meet limits by purchasing forests and agreeing not to cut them down. In a two-part series on the public radio show Marketplace, CIR explores what a forest offset looks like on the ground, in Brazil's Atlantic Forest, and the impact of a forest offset on the people who live there. Part one aired on Thursday, February 25; part two aired on Friday, February 26. These stories are produced as part of a collaborative project from CIR and FRONTLINE/World called Carbon Watch. >> Listen to part one: "Calculating the value of carbon in trees" >> Listen to part two: "Conservation projects displace locals" >> Watch the video version of this story on FRONTLINE/World: "Brazil: The Money Tree" >> Read a related story by CIR's Mark Schapiro that ran in Mother Jones: "GM's Money Trees"