Some of the world's poorest people would be half a trillion dollars a year better off if the services they provide to the rest of the planet indirectly – through conserving natural habitats – was given an economic value, a new study has found.

Many of these valuable habitats and species are under threat, but the people who live in these areas lack the means to improve their conservation, according to a new study in the journal BioScience.

If poor people were paid for the services they provide in preserving some of the world's key biodiversity hotspots, they could reap $500bn. There are some fledgling schemes that could help to raise this cash – for instance, the United Nations-backed system called Redd (Reducing Emissions from Deforestation and forest Degradation), which uses carbon trading to generate cash to preserve trees – but so far they are small in scale.

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