• 350 PPM Pathways for the United States

    This report describes the changes in the U.S. energy system required to reduce carbon dioxide (CO2) emissions to a level consistent with returning atmospheric concentrations to 350 parts per million (350 ppm) in 2100, achieving net negative CO2 emissions by mid-century, and limiting end-of-century global warming to 1°C above pre-industrial levels. The main finding is […]

  • Back to Top


  • Deep Decarbonization in the Northeast United States and Expanded Coordination with Hydro-Québec

    In this white paper, SDSN and its partners show that present policies in New York State and the New England States are insufficient to achieve the region’s declared greenhouse gas emission reduction goals. The study describes a detailed road map for achieving the region’s goal of reducing these climate-altering emissions 80% or more below 1990 levels by 2050 while maintaining high standards of living and economic growth.A key objective of the study was to investigate the potential for cost savings from increased coordination between the Northeastern U.S. and Québec, including development of Québec’s hydro and/or wind resources as well as increases in transmission capacity to complement massive renewable energy buildout and battery storage in Northeastern states.

  • Back to Top


  • Why Climate Policy Needs Long-Term Deep Decarbonization Pathways

    This SDSN Working Paper draws upon the Deep Decarbonization Pathway Project (DDPP) and proposes four preliminary tests that Intended Nationally Determined Contributions (INDCs) need to meet in order to be consistent with 2°C in addition to reductions in headline emissions.

  • Pathways to Deep Decarbonization: 2015 Synthesis Report

    In September 2015, the Deep Decarbonization Pathways Project published the Executive Summary of the Pathways to Deep Decarbonization: 2015 Synthesis Report. The full 2015 Synthesis Report was launched in Paris on December 3, 2015, at a technical workshop with the Mitigation Action Plans and Scenarios (MAPS) program.

  • Back to Top