Pollution 'to Ease in Five to 10 Years'

Officials and experts see funding as a priority issue at a two-week major United Nations climate change conference opening in Warsaw, the Polish capital, on Monday.

Xie said, "Developed countries should promise no less than the US$30 billion pledged in fast-start funding between 2013 and 2015, chart a clear course for meeting the funding pledge of US$100 billion by 2020 and invest in the Green Climate Fund as soon as possible."

Yang Fuqiang, senior adviser on energy, the environment and climate change at the Natural Resources Defense Council, an NGO in Washington, said there has been no concrete implementation of many agreements made at previous conferences.

This has dampened the enthusiasm of many parties, especially developing countries, Yang said.

"So far, we have not seen even one penny in 2013 and the year will soon be ending," Yang said. "It is obvious that on the issue of funding, developed countries have not fulfilled the commitments they made on climate change issues."

Xie said despite no financial or technological support being delivered by developed countries, developing countries, including China, have managed to reduce emissions on their own.

He said China reduced carbon dioxide emissions by 1.5 billion tons between 2006 and 2010, and by 300 million to 400 million tons from 2011 to 2012.