London mayor Ken Livingstone has reaffirmed plans to crack down on the capital's gas guzzlers and cut emissions as he unveiled his environmental manifesto this week.

Aiming for a third successive term in charge, Mr Livingstone revealed nothing new amongst his list of green policies, but simply restated proposals to bring in a £25 a day charge on "gas guzzling" cars in the congestion zone.

He said he would also extend the low emission zone charge for polluting lorries, buses and coaches to include all lorries over 3.5 tonnes from July 2008, and the heaviest vans from 2010.

Saving our environment from the threat of climate change is the most important long term issue facing humanity," he said.

"Protecting and improving London's environment is both about a higher quality of life for us all today and about the kind of city we leave for our children and grandchildren."

Livingstone also pledged more open green spaces for London by using the Olympics to create a large new urban park in Europe for 200 years, as well as a green gird of natural open spaces in the Thames Gateway.

Having already vowed to cut carbon dioxide emissions by 60 percent by 2025, Livingstone also outlined plans for a raft of new energt saving measures for the capital's public buildings.

"I will use new finance to develop a whole new approach to dealing with waste that supports more recycling and scraps incinerators and landfill in favour of new technologies to generate clean energy from waste," he said.

Livingstone also slammed rival Boris Johnson's green pledges.

"Boris Johnson's attempt to paint himself green for the purposes of being elected is entirely fake - on the environment Boris Johnson is a throwback to another age," he said.

Livingstone said he was opposed to the construction of a third runway at Heathrow airport as well as any new airport extension in the area of London including Mr Johnson's proposal for a new airport in the Thames Estuary.

"I am passionate about the environment and, if I am re-elected, I will make it my personal priority to ensure that Londoners are even better able to enjoy living in one of the greenest city in the world."

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