"This is a wake-up call and an unequivocal message that a low-carbon global economy is necessary, achievable and affordable," said Steve Howard of the Climate Group charity which organised the book and an associated exhibition.

"We are breaking climate change out of the environment box. This crisis affects all of us. This is a global challenge and we need real leadership to address these major problems -- and these ministers can give that leadership," he told Reuters.

The pictures include one of Kilimanjaro almost bare of its icecap because of global warming, and coastal defences in the Marshall Islands threatened with swamping from rising sea levels.

British Prime Minister Tony Blair has vowed to make climate change and Africa the twin targets of Britain's presidencies of both the G8 and European Union this year -- bringing both to the fore at a summit meeting in Gleneagles in Scotland in July.

The Kyoto Protocol on cutting emissions of greenhouse gases came into force in February but is still shunned by the world's biggest emitter, the United States, and puts scant limits on China, rising fast up the ranks.

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Senior officials from both countries will be at the London meeting, whose main thrust is how to achieve the environmental Holy Grail of a sustainably growing low carbon economy.

"There is an attempt to draw the United States in after its refusal to sign Kyoto," said a spokeswoman for environmental pressure group Greenpeace.

"It is very sensitive given that the developing countries are trying to climb the development curve and the developed countries must not be seen to be doing anything to hold them back," she told Reuters.

A senior official at Britain's Department of the Environment, Food and Rural Affairs, which is co-organising the meeting -- the first of environment and energy ministers from developed and developing nations -- said the aim was to find common ground.

"This is a chance for people to get together and by not forcing them to negotiate a very concrete outcome ... allow them to explore common interests," she said.

"There are plenty of technologies out there which we can deploy which can help with that shift (to a low-carbon economy) straight away. We know that energy efficiency can already deliver huge carbon savings at a net benefit to our society," she told Reuters.

British think-tank the Institute for Public Policy Research has proposed a multi-tiered approach, calling for progressively deeper cuts in greenhouse gas emissions by rich nations but more flexible commitments from the developing world.