Every so often there's good news for nature, such as the additional protection from commercial trade granted earlier this month  to rhinos, sharks, and other threatened species. But, overall, the situation for biodiversity worldwide is grim and getting worse. A scientific analysis  published last year, for example, found that half of protected tropical forests are losing species. What should be done, especially as climate changes? Should some parks be sold  to improve other protected areas? And how can the conservation of nature be reconciled with development in poor nations?
Join us on Thursday, 28 March, at 3 p.m. EDT on this page for a live chat on the future of conservation and what might be done differently.
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Peter Kareiva is chief scientist at the Nature Conservancy. He develops and helps implement science-based conservation throughout the organization. In 2010, he co-authored the textbook Conservation Science: Balancing the Needs of People and Nature .
John Robinson is executive vice president for conservation and science at the Wildlife Conservation Society. A tropical ecologist, he oversees more than 300 field projects in 53 countries in Africa, Asia, and Latin America. He has studied human impacts on biodiversity in tropical forests.
Erik Stokstad is a staff writer for Science. He covers environmental research and policy with a focus on biodiversity, natural resources, and sustainability.