Britain will face a disaster if it adopts an “isolationist approach” to the environment, the energy secretary, Ed Davey, has warned as he announced the UK is to give £720m to an international fund to help poor countries cope with climate change.

In remarks aimed at rightwing Tories and Ukip supporters, as voters go to the polls in the Rochester and Strood byelection, Davey said a “little Englander approach” would be self defeating as climate change does not recognise borders.

Davey was speaking to the Guardian on the eve of an announcement that Britain is to donate more than France and Germany to the UN’s Green Climate Fund which has a target of $10bn (£8bn). The UK commitment to the fund, seen as a vital step towards rich and poor nations sealing a deal to tackle global warming in 2015, is surpassed only by the US and Japan.

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