The Centre for Evidence-Based Conservation
"The Centre for Evidence-Based Conservation was established in 2003 with the goal of supporting decision making in conservation and environmental management through the production and dissemination of systematic reviews on the effectiveness of management and policy interventions." (From the website)

Collaboration for Environmental Evidence: Systematic Reviews for Conservation and Environmental Management
"The Environmental Evidence Library contains a collection of systematic reviews of evidence on the effectiveness and impacts of human interventions. These reviews are rigorous objective evaluations of the positive and negative effects of our actions. They may also report on the economic costs. Each review contains a summary of main findings for the benefit of the user community and may be accompanied by explanatory notes or policy briefs." (From the website)

ConservationEvidence.com: sharing conservation experience.
"The objective of this website is to make conservation more effective by sharing knowledge as to which management interventions work and which do not." (From the website)

The Campbell Collaboration: The Campbell Collaboration is an international research network that produces systematic reviews of the effects of social interventions. Campbell is based on voluntary cooperation among researchers of a variety of backgrounds. (From the website)