It wants that money to be spent directly on those in need.
Boris Johnson is announcing plans for the Clean Energy Fund at the United Nations in New York, allowing experts to use up to a billion pounds of the aid budget to invent new technology.
Ahead of his announcement, the PM said: "I have always been deeply optimistic about the potential of technology to make the world a better place. If we get this right, future generations will look back on climate change as a problem that we solved by determined global action and the prowess of technology."
Responding to today's funding announcements Dr Alison Doig, head of global policy at Christian Aid, said: "The real test of the scientific investment in tackling the climate emergency will be whether it delivers for people in poverty who - while having contributed least to this crisis - are the first and worst affected by climate change.
"The world's poorest should not be an afterthought, but aspects of today's announcement suggest they are not being seen as the priority in tackling climate change. Climate change must be viewed as a triple emergency: of poverty, climate and biodiversity, and so a joined-up approach must be reflected in any UK approaches to tackling it.
"Today's announcements in New York by Prime Minister Boris Johnson raise questions about re-allocation of aid money towards UK science and species conservation. This seems like robbing Peter to pay Paul, when in reality new and additional money is needed in the face of the climate emergency."
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