Scientists think they can now explain at least part of the recent growth in methane levels in the atmosphere. Researchers, led from Edinburgh University, UK, say their studies point to a big jump in emissions coming from just the wetlands of South Sudan.

Satellite data indicates the region received a large pulse of water from East African lakes, including Victoria. This would have boosted CH4 from the wetlands, accounting for a significant part of the rise in global methane. Dr Mark Lunt spoke to our science correspondent Jonathan Amos.