The biennial Zayed International Prize for the Environment was established four years ago in recognition of the achievements of the UAE's President Sheikh Zayed Bin Sultan Al Nahyan.

An official release states that for over three decades Sheikh Zayed has advocated sustainable development policies. His strategies - including the planting of 100 million trees are considered to have made the UAE a much greener country. In its citation the jury said that it considered that the BBC "stands apart for its commitment, breadth of coverage, and dedication to addressing global, regional and national environmental concerns".

It singled out Earth Report, which has aired on BBC World since 1997. The television programme has "not only shocked and entertained but brought about real change by inspiring businesses, NGOs [non-governmental organisations and governments to adopt more environmentally friendly technologies, lifestyles and policies". The programme is produced by Robert Lamb and TVE.

The jury also recognised the work of BBC World Service radio which broadcasts to at least 150 million regular listeners in 43 languages and BBC News Online, which receives more than 206 million page impressions per month at the website www.bbcnews.com.

In addition, the citation praised BBC staff for implementing initiatives that are making their workplaces more environmentally friendly. "The BBC has also demonstrated its commitment to environmental issues at home through the organisation's own sustainable development strategy aimed at reducing energy consumption and waste in its day-to-day operations."

The prize money of $500,000, will be donated to the BBC World Service Trust.BBC World Service Trust director Stephen King added, "The Trust is an important part of the BBC's work. This prize will make a big contribution to helping us continue our work, bringing benefit to communities in the developing world."