Are we heading for a mass extinction?

Will human actions result in the demise of huge numbers of other species - in a mass die-off, comparable to the end of the era of the dinosaurs? Neal Razzell assesses the evidence that species are dying off at a rapid rate, and looks at some of the surprising things we might do to slow or reverse this process. Producers: Beth Sagar-Fenton and Josephine Casserley