Environment ministers and officials from the Asia-Europe Meeting (ASEM) adopted a declaration after a two-day summit in the Danish capital that also recognised the "key link between energy generation and greenhouse gas emissions". The summit also pledged to step up cooperation to cut the rate of loss of biodiversity by 2010, saying they would work towards reducing deforestation.
ASEM represents more than half the world economy, grouping EU states with the 10-member Association of South East Asian Nations plus China, Japan and South Korea.
Denmark's minister for the environment, Connie Hedegaard, said there had been a growing recognition at the conference that something has to be done and that time was running out.
She said the declaration was proof that many countries, including China, were seriously considering ways to protect the environment while not stunting growth.
"There has been a shift, a higher interest from more countries," she told a news conference.
Greenpeace climate and energy adviser Daniel Mittler said the adoption of the declaration to remove barriers to technology transfer was a sign of commitment, but said EU countries could do more to support the transition to renewable energy sources in Asia.
Environment ministers from Britain and Germany attended the meeting hosted by their Danish counterpart. Other member countries, including China and South Korea, sent junior ministers.