"The links between biodiversity and ecosystem services is still undergoing research. But the most important known fact is that these services have faced major (and measurable) losses. According to the Millennium Ecosystem Assessment, the planet during the last century lost 50 percent of its wetlands, 40 percent of its forests and 35 percent of its mangroves. About 60 percent of global ecosystem services have been degraded in just 50 years.
In a research paper on biodiversity released today for Copenhagen Consensus 2012, Salman Hussain and Anil Markandya find that there will be a significant loss of biodiversity over the next 40 years. They estimate that this loss could be about 12 percent globally, with South Asia facing a loss of 30 percent and sub-Saharan Africa 18 percent. They look at three interventions and compare these to doing nothing."
Via David Rowing