The think tank proposed introducing a natural disaster visa scheme to allow people to either earn money to help rebuild their lives before returning home or settle permanently if they have no home to return to after an environmental disaster.
In its Forced to Move report, the think tank also proposed a scheme for people in vulnerable countries to be trained in sustainability skills and then either stay to help their country adapt to climate change or move to the UK for a limited period to work on the net-zero transition.
Hundreds of millions of people are expected to be displaced by the effects of climate change over the next 30 years, with some likely to seek refuge in the UK, including by illegal routes.
The report’s authors said: “A robust immigration system and an enforced border to lower the level of illegal migration into the country is key to maintaining public confidence.
“However, new controllable visa schemes for those displaced by climate change to come to the UK would enable the Government to help those most in need while protecting the integrity of the immigration system.
“Obviously, the UK does not have the capacity to help all who might be forcibly displaced by climate change over the course of the coming century.
“But, as mentioned throughout this report, the UK has demonstrated time and again that it is willing to play its part to help those most in need.”
The report called for more investment by private investors in climate adaptation in developing countries to limit the number of people forced to leave their homes by extreme weather events.
Funding for adaptation measures is likely to be a focus of this year’s Cop28 meeting in Dubai after progress on the UN’s Global Goal on Adaptation at Cop27 in Egypt, during which the UK announced £200 million in adaptation funding for African nations and promised to treble its total support for climate change adaptation to £1.5 billion by 2025.
Onward found 46% of the public backed greater funding for climate adaptation, compared with 28% who opposed it, but only 29% thought the UK had an obligation to host climate refugees.
One of the reports co-authors, Ted Christie-Miller, said: “We cannot allow climate-related migration to become the defining crisis of the 21st century.
“The Government needs to act now to build climate resilience in the most vulnerable regions on the planet and open up safe and legal visa routes for those fleeing environmental disasters.”
Last year, the Barbados prime minister warned that the number of people displaced by the impacts of the climate crisis will increase without a different approach to countries suffering from disaster.
Mia Mottley made the comments at the Cop27 climate summit in Egypt.