"I think the role of genomics is enormous whether it is the GM (genetically modified) type or other genomic techniques which improve things. We need to do it," he said in an interview.

Speaking after attending a conference on food security in London, Beddington said demand for food was expected to grow by about 50 percent by 2030 due to both a rising global population and changing diets in developing countries.

A needed expansion in production, however, would have to be achieved with less land, less water and less energy while not increasing emissions of greenhouse gases, he said.

"The green revolution 30, 40 years ago was built on much more fertiliser, much more pesticides, very extensive irrigation and seed improvements. Those were the major planks," he said.

"I don't believe we can solve our current problems in the way we did in the original revolution so we need a new and greener one. The new greener revolution is needing to be a tad more sophisticated," Beddington added.

He said that pests and disease currently resulted in losses of about 40 percent in certain crops and climate change would pose new threats.

"The losses due to pest and disease are very substantial and climate change has the potential to exacerbate that as some plants and indeed animal diseases are taking advantage of an altered climate to expand their range," he said.

Beddington said that crop breeding had the potential to generate improved resistance to some of the key pests and diseases.

Climate change could also reduce the amount of land suitable for agriculture and would mean care would have to be taken if land in areas such as the former Soviet Union is brought back into active production.

"There is definitely extra land which could be put into agricultural production but the question is what does that land look like. For example, if it is permanent grassland it has the potential to release greenhouse gases," he said.

Huge swathes of farm land in Russia have been left fallow since the fall of communism.

Beddington said if meat and dairy prices were to rise then it could curtail demand growth.

"To the extent that happens in the developed world that is probably OK. To the extent it happens in the developing world you've got real issues of malnutrition and hunger," he said. (Editing by Michael Roddy)