Nature: Biosphere a ‘net source’ of greenhouse gases

Researchers say the biosphere, which includes the plants, animals and organisms on land around the world, has become a "net source" of greenhouse gases such as methane and nitrous oxide, reports the Washington Post, citing a study in the journal Nature.

Finding Nemo’s Garden

A team of engineers is testing the practicality of growing food crops in small, inflatable greenhouses in the ocean.