Four years ago Sian Berry launched her political career by handing out fake parking tickets to SUV drivers in North London.
Last year she persuaded London Mayor Ken Livingstone to introduce a special tax on the so-called 'Chelsea Tractors'.
Berry has had some big ideas of how London could change into an eco-city and now she standing as London Mayor on a Green Party ticket so she can get the job done herself.
"When you normally think of Greens you think they should all be out in the countryside hugging trees, she said. "But actually cities are a great place to be. They offer a great opportunity to change things."
Berry, a co-founder of the Alliance Against Urban 4x4s, has risen quickly through the Green Party ranks since she joined seven years ago, not least for her headline-grabbing activism.
She once picketed Chelsea FC dressed as a footballer's wife with a placard that said: "Your Range Rover is so over."
The "Green Goddess", as she is known in the media, was also credited with sending two Bin Laden look-alikes to Downing Street with a fake canister of nuclear waste and a card that read: "Thank you very much for the present of nuclear power."
Now the photogenic 33-year-old is looking to take on heavyweights Boris Johnson and Ken Livingstone for May's London Mayoral elections. And its clear to her how important it is.
"We've had Greens having quite a big say for the past four years," she said. "We have two active members in the London Assembly and they have had a casting vote over the Mayor's budget.
"At the moment we can only get policies through by long negotiation. If we had a Green Mayor we would be able to push things through a lot easier."
Berry was born in Cheltenham to two teachers. She lost an election battle against Glenda Jackson in the 2005 election in the Hamstead and Highgate constituency and similarly failed to gain a seat as a Camden councillor in 2002 and 2006.
However it is clear that Berry has an attractive package of reforms to make her a tough opponent to "policy-free" Tory candidate Boris Johnson.
She is calling for low-cost loans for those who wish to install renewable energy technology, free insulation for every home that needs it, and solar electric heating on 100,000 homes within seven years.
However to fund these changes she refuses to increase council tax. "I believe that council tax is a really unfair tax anyway, it unfairly targets the poor. I wouldn't put that up.
"The LDA have a budget of £400 million but only £29 million of that is going on sustainable development. That's a very small proportion.
"I want to use that money to encourage small businesses in London so we aren't reliant on big oil companies for our economy. The rest of that money would go to free insulation for homeowners."
She said she is also proposing to close London's City airport and turn it into a "green industries park" to stimulate small business growth.
One of the main problem's with current Mayor Ken Livingstone, she said, was his "obsession with high rise buildings".
She added: "Ken has got better but he doesn't have the right vision about where London's economy is going. He's definitely got green ideas in his head, it is how things are borne out in reality that I have issue with."
It is Boris Johnson that she reserves particular spleen for. And there is no wonder.
Should Boris win office the Tories would have an absolute majority in the London Assembly and the Mayor would no longer have to rely so heavily on winning the support of the two floating Green voters to get his plans off the ground.
Without this bargaining power, she believes that Green policies would go to the wall.
"Tories are very good at drawing red lines through Green policies," she said. "That's a very terrifying prospect. I don't trust Boris one bit. He comes across as very affable on the surface but underneath he's a rank Tory."
But while the idea of a Green London Mayor seems way off, Berry believes that the city already has greener credentials than most. More people use buses and cycle in the capital than anywhere else in England.
Moreover, there are, she says, eight Green Mayors in America – "and that's America," she adds. There are also Green Party candidates holding the office in Paris and Brussels.
While she says that it would be "quite extraordinary" if she won, she adds: "When they first came up with the idea of the office of the mayor, it was designed for someone who wasn't party political or affiliated with any of the main parties.
"There's absolutely no reason why we couldn't have a Green Mayor.
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