SHANGHAI - The United Nations Environment Programme (UNEP) will issue a report to assess the carbon footprint from the Expo 2010 Shanghai at the end of the event, a senior UN official said on Sunday.

The report will review the goals set by the organizers of the Expo and study how a low carbon footprint, as well as how environmental responsibility and efficiency at the Expo could be achieved, said UN Under Secretary-General Achim Steiner, who also serves as the executive director of the UNEP.

Citing the use of electric buses and hydrogen-powered vehicles, Steiner said that many experiments and innovations using green energy and technology have been carried out at the Expo site.