(AFP) – 1 hour ago COCHABAMBA, Bolivia — A “people’s conference” on climate change agreed in Bolivia Thursday to call for the halving of greenhouse gas emissions by 2020 at the next UN climate meeting in Mexico in December.

Some 20,000 environmental activists, indigenous leaders and unionists called for “collective, then individual, obligations for the reduction of greenhouse gases,” instead of the non-binding accord adopted at the end of last year in Copenhagen, which the group dubbed a “failure.”

The UN Ambassador to Bolivia, Pablo Solon, said that a 50 percent reduction could limit the warming of the planet to 1.5 degrees Celcius, instead of the two degrees agreed to in Copenhagen but which would not be met under current individual country pledges.

The three-day Cochabamba forum, organized by leftist Bolivian President Evo Morales, also recommended the creation of an international climate tribunal to judge countries on global warming.

It promised to take steps to create a declaration of Earth rights and to organize an international referendum on the environment to coincide with the next Earth Day, on April 22, 2011.

The conference followed a preparatory meeting between representatives from the world’s leading economies in Washington ahead of the December UN summit in Cancun, Mexico.

The United States on Monday downplayed hopes of clinching a new climate treaty this year, warning against unrealistic expectations despite what it said was growing agreement among major nations.

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