This document contains a compilation and synthesis of the third biennial reports submitted to the secretariat by Parties included in Annex I to the Convention. It provides information on a range of issues relating to the implementation of the Convention, such as quantified economy-wide emission reduction targets and progress towards their achievement, including information on mitigation actions and their effects and estimates of emission reductions and removals and the use of units from market-based mechanisms and land use, land-use change and forestry activities; greenhouse gas emission projections; and the provision of financial, technological and capacity-building support to developing country Parties.