UN Environment 1 Gigaton Report

Renewable Energy and Energy Efficiency in Developing Countries: Contributions to Reducing Global Emissions finds that internationally supported projects, implemented in developing countries between 2005 and 2016, could reduce 0.6 gigatonnes of carbon dioxide equivalent (GtCO₂e) from annual emissions by 2020. One gigatonne is roughly equivalent to a year of transport emissions in the European Union (including aviation).