The call unites Ken Livingstone and Siân Berry on the basis of common policies on the environment and helps unite the majority of Londoners who want to keep taking London forward.
Voters can cast two votes for Mayor on 1 May - a first and a second preference. After all the first preference votes have been counted, the two candidates with the highest totals go into a final ballot. The second preference votes cast by people who supported lower placed candidates are then counted and added to the first preference totals of the two top placed candidates.
The joint announcement took place as the two set out five key green commitments for London. They are:
- We will introduce a £25 a day CO2 charge for gas-guzzling cars like some 4x4s, high-powered sports cars, and luxury executive vehicles
- We will not reduce the size of the Congestion Charge Zone
- We will keep the Low Emission Zone to improve air quality and extend it to include lorries over 3.5 tonnes and, from 2010, heavier vans
- We will oppose all further airport expansion serving London, including at Heathrow and Boris Johnson's plan for a new airport in the Thames Gateway
- We will continue to set a target that at least 50% of all new houses should be affordable to Londoners on lower incomes
Siân Berry and Ken Livingstone issued a joint statement saying: "Tackling climate change and creating a fairer London must be at the top of any serious Mayor's agenda. Boris Johnson, who supported George W. Bush in opposing the Kyoto Treaty and would scrap the CO2 charge on gas guzzlers, cannot be trusted with London's environment. Nor can a man who opposed the minimum wage be expected to promote fairness or tackle poverty. London - with a committed Mayor and Green Party representation on its Assembly - has taken a global lead on environmental and social justice over the last eight years. Let's keep it that way."