Accelerating Clean Energy Ambition

The Union of Concerned Scientists (UCS) analysis concludes that the United States can meet its climate goals through a rapid phase-out of fossil fuels and a transition to clean energy, which would yield significant economic and public health benefits. While the Inflation Reduction Act (IRA) and Infrastructure Investment and Jobs Act (IIJA) provide critical momentum, the report finds that the U.S. will fall short of its 2030 goals without additional robust policies. The most effective near-term strategy is the decarbonization of the power sector via wind and solar, while long-term reductions depend on the electrification of transportation, buildings, and industry. The report emphasizes that reducing overall energy demand can lower the required scale of new infrastructure and that a just transition must prioritize marginalized communities and hold fossil fuel companies accountable.

• The United States is currently on track to miss its 2030 goal of cutting emissions 50 to 52 percent below 2005 levels, as existing policies including the IRA and IIJA are insufficient to close the gap.
• To meet climate targets, the U.S. must increase its annual rate of emissions reductions to more than 5 percent per year, compared to the approximately 3 percent per year enabled by the IRA.
• A rapid phase-out of fossil fuels is essential; under the Net Zero Pathway, overall fossil fuel use would drop 50 percent by 2040 and 82 percent by 2050, with coal completely removed from the power sector by 2030.
• Decarbonizing the power sector using wind and solar is the primary driver for near-term reductions, with renewables potentially increasing from 22 percent of generation in 2021 to 92 percent by 2050.
• The transition to clean energy is projected to be cost-effective, with the Net Zero Pathway resulting in net savings of more than $101 billion in 2030 due to IRA incentives and increased efficiency.
• Phasing out fossil fuels provides substantial public health benefits; the Net Zero Pathway could avoid up to 75,900 premature deaths by 2050 (high estimate) and reduce avoided climate damages by nearly $1.3 trillion by 2050.
• Electrification is critical for long-term reductions, with the model assuming 100 percent of new sales for personal and heavy-duty trucks are battery electric or fuel cell vehicles by 2035.
• Certain hard-to-decarbonize sectors like steelmaking and long-distance air travel will require a limited role for technologies with higher tradeoffs, such as biofuels, hydrogen, and CCUS.
• Carbon Capture, Utilization, and Storage (CCUS) is not needed to decarbonize the power sector but is projected to represent nearly 16 percent of economy-wide emissions reductions by 2050 under the Net Zero Pathway.

APA

Clemmer, S., Cleetus, R., Martin, J., Moura, M. C. P., Arbaje, P., Chavez, M., & Sattler, S. (2023). Accelerating Clean Energy Ambition. Union of Concerned Scientists. https://www.ucs.org/sites/default/files/2023-11/accelerating-clean-energy-ambition-report_0.pdf

Chicago

Clemmer, Steve, Rachel Cleetus, Jeremy Martin, Maria Cecilia P. Moura, Paul Arbaje, Maria Chavez, and Sandra Sattler. Accelerating Clean Energy Ambition. Union of Concerned Scientists, 2023. https://www.ucs.org/sites/default/files/2023-11/accelerating-clean-energy-ambition-report_0.pdf.

Wikipedia

{{cite report |last1=Clemmer |first1=Steve |last2=Cleetus |first2=Rachel |last3=Martin |first3=Jeremy |last4=Moura |first4=Maria Cecilia P. |last5=Arbaje |first5=Paul |last6=Chavez |first6=Maria |last7=Sattler |first7=Sandra |title=Accelerating Clean Energy Ambition |publisher=Union of Concerned Scientists |date=November 2023 |url=https://www.ucs.org/sites/default/files/2023-11/accelerating-clean-energy-ambition-report_0.pdf |access-date=23 October 2026 |via=Climate Insights Directory}}

BibTeX

@techreport{clemmer2023accelerating, author = {Clemmer, Steve and Cleetus, Rachel and Martin, Jeremy and Moura, Maria Cecilia P. and Arbaje, Paul and Chavez, Maria and Sattler, Sandra}, title = {{Accelerating Clean Energy Ambition}}, institution = {Union of Concerned Scientists}, year = {2023}, month = nov, url = {https://www.ucs.org/sites/default/files/2023-11/accelerating-clean-energy-ambition-report_0.pdf}, urldate = {2026-10-23}, note = {Indexed by Climate Insights Directory} }