Eastern European, Caucasus and Central Asian (EECCA) countries are at an environmental crossroad. The current environmental situation is dire and challenges are mounting, but there are also new opportunities. EECCA countries need to set clear priorities and targets to guide both their own action programmes and multi-stakeholder partnerships. Knowledge transfer and institutional development are required to facilitate policy reform, and to tackle strategic and operational bottlenecks, including much needed investments in environmental infrastructure and modern technologies. This report explains the environmental challenges that these transition economies face, and assesses the financial tools and resources available to tackle them. The publication of this report is part of the OECD programme of work with non-member economies, in the context of the Task Force for the Implementation of the Environmental Action Plan for Central and Eastern Europe, the Caucasus and Central Asia (EAP Task Force). It is directly related to a series of projects on environmental finance in transition economies, which was initiated in 1993 and that has focused on EECCA since 1998.