The Deep Decarbonization Pathways Project (DDPP) is a global collaboration of energy research teams charting practical pathways to deeply reducing greenhouse gas emissions in their own countries. It is predicated on taking seriously what is needed to limit global warming to 2°C or less. The initial results of this collaboration are reflected in reports on deep decarbonization pathways for Australia, Brazil, Canada, China, France, Germany, India, Indonesia, Italy, Japan Mexico, Russia, South Africa, South Korea, the United Kingdom and the United States, which are housed at the DDP website. In addition, the consortium has developed cross-cutting analyses and open-source tools.