Depending on the study. A new paper by Sodhi et al., featured in the Yale E360 blog, says that conservationists are doing some things right. Land and marine habitat conservation are in the plus column, with more than 100,000 protected areas, covering 7.3 million square miles globally.
Sodhi, N.S., R. Butler, W.F. Laurance, and L. Gibson. 2011. Conservation successes at micro-, meso-, and macroscales. Trends in Ecology and Evolution. http://dx.doi.org/10.1016/j.tree.2011.07.002
Praxis in Landscape Architecture 
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