The changing earth medium
A European Space Agency illustration for Biomass. - 

The European Space Agency has just given the green light to a project called Biomass, a satellite resembling an upside-down trampoline, that will be able to scan forests from outer space. Scientists hope the project can tell us a lot about the world's forests, the carbon they hold, and their impact on Earth's climate.

Jon Amos, science correspondent for the BBC, tells Marketplace Tech host Ben Johnson more about the project.