The Global Warming Pollution Reduction Act - Summer

This report evaluates the scientific and policy foundations of the Global Warming Pollution Reduction Act (S.309), proposed legislation aimed at reducing greenhouse gas emissions in the United States. The analysis begins with the scientific basis of climate change, explaining how greenhouse gases such as carbon dioxide and methane trap infrared radiation and increase global temperatures. Scientific evidence from atmospheric measurements, climate models, and historical data demonstrates that greenhouse gas concentrations have risen sharply since the industrial revolution. The resulting impacts include sea level rise, biodiversity loss, increased extreme weather events, threats to human health, and shifts in seasonal patterns. The United States contributes a significant portion of global greenhouse gas emissions, primarily from fossil fuel combustion in transportation and electricity generation, highlighting the need for national policy action to address climate change.

The proposed legislation would amend the Clean Air Act to regulate carbon dioxide emissions and establish long-term emission reduction targets. The bill sets a pathway to reduce emissions to 80 percent below 1990 levels by 2050 through a combination of regulatory standards and market-based mechanisms. Key provisions include stricter vehicle emission standards, emission limits for power plants, renewable energy requirements, and programs supporting research and development of low-carbon technologies. The legislation also encourages market tools such as credit trading to improve cost-effectiveness. While the scientific basis for emission reductions is strong, the report identifies uncertainties related to emerging technologies such as carbon sequestration and the economic implications of large-scale energy transitions. Overall, the report concludes that coordinated regulatory and market approaches are essential for reducing emissions and transitioning toward a lower-carbon energy system.

Learn more about the MPA-ESP Workshop in Applied Earth Systems Management.