Volkswagen continues to be targeted in what Greenpeace is calling its most successful online campaign ever.

An estimated four million people have watched the environmental group’s online film (click here to view) attacking Volkswagen’s record on climate change, while 370,000 people have signed up to join the campaign against the carmaker.

Now Greenpeace is offering a £5,000 budget to whoever produces the best one minute anti-VW advert – with the prize money to be spent on making the campaign’s next movie.

The competition is being run across the UK, Germany, France and Belgium. It will be launched on Saturday, September 17 at the Curzon cinema in Soho with the closing date two weeks later.

A panel of ‘PR experts and film professionals’ will choose the winner and there will also be a public vote to pick an audience favourite.

Greenpeace climate change campaigner Richard George said: “VW markets itself as a green car company. But in reality it lobbies against key climate change laws and only fits the most fuel efficient technology to a small proportion of its vehicles."

The website www.vwdarkside.com outlines Greenpeace’s objections to the carmaker.

Volkswagen said it would not be responding to the accusations.