Legislators from 16 major economies will meet on Saturday to seek consensus on a raft of climate-related policies ahead of December talks in Copenhagen.
The 120 delegates believe that the policies could address 70% of the emissions cuts necessary before 2020.
A consensus, if reached, could ensure the policies are put into practice regardless of the outcome of the landmark climate talks in December.
The group will present its results to the Danish PM who will host the talks.
The delegates will include a number of MEPs and former UK Foreign Office head Lord Michael Jay alongside people holding in climate- and environment-related posts in 16 nations.
The meeting has been organised by the Global Legislators Organisation for a Balanced Environment (Globe).
Issues to be discussed are standards for building and appliance standards, vehicle fuel efficiencies, renewable energy and forestry.
Together, the delegates hope to agree targets that they have committed to push through their own governments at home. In addition, they will band together to push for ambitious targets at the December COP15 (Conferences of the Parties) meeting.
Any deals that are agreed at the weekend meeting are particularly relevant in light of the claim made last week by Yvo De Boer, head of the UN Climate Change Secretariat, that a comprehensive and binding treaty at the December talks was unlikely.
Danish Prime Minister and COP15 host Lars Lokke Rasmussen said of the meeting: "The Globe Copenhagen Legislators Forum...presents a very real opportunity to outline to national leaders where the political boundaries could be for an ambitious agreement at the formal negotiations.
"This will be a powerful and new intervention contributing to the international response to climate change."