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The adverts feature a petrol pump held to the head of an orang-utan. ?Tell the Government to choose the right biofuel.? it says, ?or the orang-utan gets it.?

The groups believe a misjudged push for the wrong kinds of 'green' fuels could damage the climate and destroy some of the world's last remaining rainforests. Biofuels can be used in place of petrol and diesel - because they can be produced from crops, they could reduce greenhouse gas emissions and can play a small part in reducing emissions from transport.

However, critical to the efforts to reduce greenhouse gases is the preservation of these forests that could be sacrificed for fuel. The coalition is warning that the government risks implementing an ill-thought out policy which lacks the appropriate safeguards, meaning that the government could be creating more problems than it solves.

In the advert, the public are encouraged to write to the government and demand tough compulsory standards.

John Alker, Senior Public Affairs Officer at WWF-UK said: ?A climate change policy that potentially increases rather than cuts CO2 emissions is clearly a nonsense. Biofuels could offer part of the solution to climate change - but government needs to get this policy right in order to do so.?