The first of four webcast Earth Debates in advance of Rio+20 will happen at 19.00 on Wednesday 25 January.

Ecosystem services – can we put a price on nature? will be chaired by BBC Environment correspondent Richard Black. The panellists will comprise:
• The Rt Hon Caroline Spelman MP, Secretary of State for the Environment, Food and Rural Affairs who is the lead representative at Rio+20 for the UK
• Claire Brown was a senior scientist at UNEP-WCMC who coordinated the UK National Ecosystem Assessment development
• Will Evison, an environmental economist with leading consultants PwC was the editor of the TEEB for Business report.
• Ian Dickie, a Director of the city business Aldersgate group which lobbies for better business engagement in the green economy.
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What questions would you like the experts to answer? Tweet your views now using hashtag #earthdebates and join the debate online.

With thanks to the United Nations Decade on Biodiversity (UNDB) UK Friends Newsletter (13 January 2012) for this information.