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global warming around the world, said. "These are parts of the world where hundreds of millions of people will no longer be able to feed themselves."
Mr Pendleton said: "This means you're talking about any form of development going straight out of the window. The vast majority of poor people in the developing world are small-scale farmers who... rely on rain."
A glimpse of what lies ahead
The sun beats down across northern Kenya's Rift Valley, turning brown what was once green. Farmers and nomadic herders are waiting with bated breath for the arrival of the "short" rains - a few weeks of intense rainfall that will ensure their crops grow and their cattle can eat.
The short rains are due in the next month. Last year they never came; large swaths of the Horn of Africa stayed brown. From Ethiopia and Eritrea, through Somalia and down into Tanzania, 11 million people were at risk of hunger.
This devastating image of a drought-ravaged region offers a glimpse of what lies ahead for large parts of the planet as global warming takes hold.
In Kenya, the animals died first. The nomadic herders' one source of sustenance and income - their cattle - perished with nothing to eat and nothing to drink. Bleached skeletons of cows and goats littered the barren landscape.
The number of food emergencies in Africa each year has almost tripled since the 1980s. Across sub-Saharan Africa, one in three people is under-nourished. Poor governance has played a part.
Pastoralist communities suffer most, rather than farmers and urban dwellers. Nomadic herders will walk for weeks to find a water hole or riverbed. As resources dwindle, fighting between tribes over scarce resources becomes common.
One of the most critical issues is under-investment in pastoralist areas. Here, roads are rare, schools and hospitals almost non-existent.
Nomadic herders in Turkana, northern Kenya, who saw their cattle die last year, are making adjustments to their way of life. When charities offerednew cattle, they said no. Instead, they asked for donkeys and camels - animals more likely to survive hard times.
Pastoralists have little other than their animals to rely on. But projects which provide them with money to buy food elsewhere have proved effective, in the short term at least.
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