POZNAN, Poland, Nov. 30 (Xinhua) -- UN climate chief Yvo de Boer on Sunday called on the U.S. President-elect Barack Obama to show leadership in addressing the climate change amid a contagious financial crisis.

    Speaking at a press conference on the eve of this year's climate talks in Poznan in central Poland, Boer said he expects President-elect Obama to lead the United States to show leadership at both national and international level.

    The United States should "show leadership at the national level by putting an ambitious policy package (on climate change) in place, bringing the U.S. emission back down to the 1990 level by 22 percent," the executive secretary of the UN Framework Convention on Climate Change (UNFCCC) said.

    "I expect him to show leadership on the international level, as in Bali, Indonesia, last year, that many countries call on the U.S. to show leadership," Boer told reporters.

    He also called on Obama to deliver on his promise that the president-elect will engage with the developing countries that could find a joint solution to the climate issue.

    The Poznan talks on climate change is designed to seal an agreement at the Copenhagen meeting next year to replace the current Kyoto Protocol that binds 37 countries to a 5 percent reduction in greenhouse gas emissions below the 1990 levels and is to expire in 2012.

    U.S. Senator John Kerry will lead the U.S. Senate delegation to the UN's climate meeting in Poznan.

    "Senator John Kerry has indicated that even though he does not think it will be feasible for the U.S. to adopt a domestic policy package in a year's time, he does believe it's possible for the United States to contribute to an international agreement in Copenhagen," Boer said.

    The Poznan talks, however, was cast shadow by the contagious financial crisis, which would limit government rooms for concessions during the talks as they are channeling billions of U.S. dollars to shore up their faltering market. Boer agreed that the financial crisis is having an impact on the world's fight against climate change.

    "The financial crisis also have an impact on climate change. It is also having an impact in a number of ways," he said.

    The Poznan talks will aim to table a blueprint for parties to negotiate for the first time in a bid to secure an agreement in Copenhagen in December next year.