The announcement is due to be made at a meeting of world governments in Japan to try to halt global destruction of biodiversity, and it is hoped that such a move by a major developing economy will prompt other countries to join the initiative.
Work on agreeing common measures, such as the value of ecosystems and their "services" for humans - from relaxation to clean air and fertile soils - will be co-ordinated by the World Bank, which hopes it can sign up 10-12 nations and publish the results by 2015 at the latest.
The move fulfils one of the key demands of a major report also being published today at the Japan meeting, a UN study of The Economics of Ecosystems and Biodiversity (TEEB). Read the full report here.
Source: Juliette Jowit, guardian.co.uk.