Global COP26 climate negotiations are the "last, best hope" to keep the goal of limiting global warming to 1.5C alive, said summit president Alok Sharma
Beijing, the world's biggest polluter, has sought to position itself in recent years as a world leader on environmental issues.
Goals include protecting 30% of lands and oceans, a measure led by France and Costa Rica.
If elected, Figueres would be the first woman and the second Latin American, after Peru’s Javier Pérez de Cuéllar, to lead the U.N.
Costa Rica plans to sign the "Under 2 MOU" carbon emissions reduction pledge, committing the country to emit less than 2 metric tons of greenhouse gases per capita annually by 2050, regardless of whether the U.N. Climate Change Conference in Paris yields an agreement.
The U.N. detailed a doubling in weather-related disasters in the past 30 years, a week before world leaders gather in terror-struck Paris for climate talks.
As the world prepares for the most important global climate summit yet in Paris later this month, news from Greenland could add urgency to the negotiations. Another major glacier appears to have begun a rapid retreat into a deep underwater basin, a troubling sign.
U.N. chief Ban Ki-moon said the 195-nation climate negotiations in Bonn were "frustrating" and "slow." "We don't have any 'plan B' because we don't have any 'planet B,'" he said.
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