The methane produced by cattle farming is more noxious to the environment in terms of global warming than the CO2 produced by all the world's cars.
As the global population booms and demand strains the world's meat supply, there is a growing need for alternatives to animal proteins.
Russell Beard travels to a research lab in the Netherlands where Marcel Dicke and his team are investigating the nutritional potential of insects, which produce nine times as much protein per kilo of feed than is yielded by livestock.
'earthrise' is an award-winning series exploring solutions to the environmental challenges we face today.
The programme takes an upbeat look at ecological, scientific, technological and design projects all around the world, from a group of Dutch architects who design stunning buildings made from waste materials, to an ingenious project that has dramatically cut rhino poaching on a South African game reserve