Aid and climate spending is one “lever” the government can pull to help curb illegal migration, the environment secretary has told Sky News.

Tackling the issue is a priority for the Conservatives and this week the government struck a new deal with France to try to reduce Channel crossings in small boats.

Asked if spending on international climate programmes, which comes from the aid budget, can help tackle the issue, Therese Coffey said: “I think they all help in that regard.

“Having that stability, bringing peace and prosperity for people and the planet. They go hand in hand,” she said in an interview at the COP27 climate summit in Egypt.

But Rishi Sunak slashed overseas aid from about £14bn a year to £11bn when he was chancellor, hitting projects such as those supporting girls’ education and polio vaccinations for children.

Since becoming prime minister – and seeking to fill a £55bn hole in the public coffers – Mr Sunak has continued to classify more spending in Britain as aid, leaving much less for overseas.

Climate funding is a priority area for the UK’s aid, but experts warn humanitarian and climate challenges often overlap.

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MPs fear the aid budget could be cut further, from 0.5% to 0.3% of gross national income, already down from 0.7% 2020.

At the conference in Sharm El-Sheikh, the environment secretary announced various small pots of money, including £5m of new cash to help tackle deforestation in the Amazon.

Donning a Union Jack-patterned scarf, the minister said investing in climate and aid spending helps create “stable countries and food production, sustainable use of resources – it all comes together”.

Some 21 million people are uprooted from their homes each year by extreme weather like floods, storms and scorching temperatures.

In many parts of the world this is being supercharged by climate change, according to the United Nations.

These numbers are expected to soar in the coming decades. International think tank IEP estimates more than a billion people could be displaced globally by 2050 due to climate change and natural weather dangers.

Watch the Daily Climate Show at 3.30pm Monday to Friday, and The Climate Show with Tom Heap on Saturday and Sunday at 3.30pm and 7.30pm.

All on Sky News, on the Sky News website and app, on YouTube and Twitter.

The show investigates how global warming is changing our landscape and highlights solutions to the crisis.

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