Professor John Beddington, Chief Science Advisor for the UK, says that climate change and a growing world population will cause a "perfect storm" of food, energy and water shortages by 2030.

"We head into a perfect storm in 2030, because all of these things are operating on the same time frame," Beddington told the Guardian.

"If we don't address this, we can expect major destabilisation, an increase in rioting and potentially significant problems with international migration, as people move out to avoid food and water shortages," he added.

Also, the BBC has video interview with Dr. Beddington.