Growing world population will cause a "perfect storm" of food, energy and water shortages by 2030, the UK government chief scientist has warned.
By 2030 the demand for resources will create a crisis with dire consequences, Prof John Beddington said.
Demand for food and energy will jump 50% by 2030 and for fresh water by 30%, as the population tops 8.3 billion, he told a conference in London.
Climate change will exacerbate matters in unpredictable ways, he added.
"It's a perfect storm," Prof Beddington told the Sustainable Development UK 09 conference.
"There's not going to be a complete collapse, but things will start getting really worrying if we don't tackle these problems."
Prof Beddington said the looming crisis would match the current one in the banking sector.