Beckett, according to a text of her speech obtained by Reuters, will cite reduced rainfall in the Middle East as a possible trigger for security problems.

"Look at those things that are highest on the European agenda -- strong borders, poverty reduction, the risks of conflict and international terrorism, energy security, jobs and growth," Beckett will say.

"Get our response right to climate change and our ability to deal with all of these is enhanced. Get it wrong and our efforts across the board will be undermined."

Beckett's speech follows an EU leaders' meeting in Finland last week that focused on energy policy and urged action on climate change.

She will say climate change, with drastically diminishing resources in some of the most volatile parts of the world, has the potential to create a "potentially catastrophic dynamic" in regions already at breaking point.

Beckett, a former environment minister, will say the Middle East is a case in point as climate models suggest Saudi Arabia, Iran and Iraq will be among those countries to see the biggest rainfall reductions in the world.

Egypt -- a pivotal country for regional stability -- will suffer a double blow, she will say, as loss of flow from the river Nile and rising sea-levels in the north are set to destroy the country's agricultural heartland.

Beckett will urge governments to produce incentives and penalties designed to drive private capital toward a low-carbon world economy.

"The greatest security threat we face as a global community won't be met by guns and tanks," she will say.