* China to "endeavour" to limit CO2 per unit of GDP
* Shift from fossil fuels, plant trees
NEW DELHI, Jan 29 (Reuters) - China has reiterated a goal of slowing the rise of its greenhouse gases by 2020 as part of pledges due by Jan. 31 under a "Copenhagen Accord" for combating climate change, an official letter showed on Friday.
The letter, dated Jan. 28, said China "will endeavour to lower its carbon dioxide emissions per unit of GDP by 40 to 45 percent by 2020 compared to the 2005 level". That would let emissions keep rising, but less quickly than economic growth.
A copy of the letter was obtained by Reuters in New Delhi. China, India, South Africa and Brazil met in the Indian capital on Jan. 24 and expressed support for the Copenhagen Accord, while urging donors to keep promises of aid.
China would also try to "increase the share of non-fossil fuels in primary energy consumption to around 15 percent by 2020 and increase forest coverage by 40 million hectares and forest stock volume by 1.3 billion cubic metres by 2020 from the 2005 levels", the letter said.
The goals were in line with targets set by Beijing last year before the Copenhagen conference.
Many other nations have also reiterated existing goals for slowing global warming before a Sunday deadline for making commitments under the Copenhagen Accord, which sets an overriding goal of limiting a rise in world temperatures to less than 2 degrees Celsius (3.6 F).
The letter, written by Su Wei, a senior Chinese negotiator, was addressed to Yvo de Boer, head of the U.N. Climate Change Secretariat. Su added that the domestic targets were "voluntary in nature".
Last month in Copenhagen, Chinese Premier Wen Jiabao told the summit that his country might even exceed its carbon goal. "Whatever outcome this conference may produce, we will be fully committed to achieving and even exceeding the target," he said. (Reporting by Krittivas Mukherjee in New Delhi, writing by Alister Doyle in Oslo; editing by David Stamp)
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