National Research Council (5/19/10)
The National Research Council issued new three reports emphasizing why the U.S. should act now to reduce greenhouse gas emissions and develop a national strategy to adapt to the inevitable impacts of climate change. The reports by the Research Council, the operating arm of the National Academy of Sciences and National Academy of Engineering, are part of a congressionally requested suite of five studies known as America’s Climate Choices.
“These reports show that the state of climate change science is strong,” said Ralph J. Cicerone, president of the National Academy of Sciences. “But the nation also needs the scientific community to expand upon its understanding of why climate change is happening, and focus also on when and where the most severe impacts will occur and what we can do to respond.”
The report suggests a range of emissions from 170 to 200 gigatons of carbon dioxide (CO2) equivalent for the period 2012 through 2050 as a reasonable goal, a goal that is roughly in line with the range of emission reduction targets proposed recently by the Obama administration and members of Congress. Even at the higher end of this range, meeting the target will require a major departure from “business-as-usual” emission trends. The report notes that with the exception of the recent economic downtown, domestic emissions have been rising for most of the past three decades. The U.S. emitted approximately 7 gigatons of CO2 equivalent in 2008 (the most current year for which such data were available). If emissions continue at that rate, the proposed budget range would be used up well before 2050, the report says.
A carbon-pricing system is the most cost-effective way to reduce emissions. Either cap-and-trade, a system of taxing emissions, or a combination of the two could provide the needed incentives. While the report does not specifically recommend a cap-and-trade system, it notes that cap-and-trade is generally more compatible with the concept of an emissions budget.
Carbon pricing alone, however, is not enough to sufficiently reduce domestic emissions, the
report warns. Strategically chosen, complementary policies are necessary to assure rapid progress in key areas such as: increasing energy efficiency; accelerating the development of renewable energy sources; advancing full-scale development of new-generation nuclear power and carbon capture and storage systems; and retrofitting, retiring, or replacing existing emissions-intensive energy infrastructure. Research and development of new technologies that could help reduce emissions more cost effectively than current options also should be strongly supported.
The compelling case that climate change is occurring and is caused in large part by human activities is based on a strong, credible body of evidence, says Advancing the Science of Climate Change, one of the new reports. While noting that there is always more to learn and that the scientific process is never “closed,” the report emphasizes that multiple lines of evidence support scientific understanding of climate change. The core phenomenon, scientific questions, and hypotheses have been examined thoroughly and have stood firm in the face of serious debate and careful evaluation of alternative explanations.
“Climate change is occurring, is caused largely by human activities, and poses significant risks for — and in many cases is already affecting — a broad range of human and natural systems,” the report concludes. It calls for a new era of climate change science where an emphasis is placed on “fundamental, use-inspired” research, which not only improves understanding of the causes and consequences of climate change but also is useful to decision makers at the local, regional, national, and international levels acting to limit and adapt to climate change.
The report recommends that a single federal entity or program be given the authority and resources to coordinate a national, multidisciplinary research effort aimed at improving both understanding and responses to climate change. The U.S. Global Change Research Program, established in 1990, could fulfill this role, but it would need to form partnerships with action-oriented programs and address weaknesses that in the past have led to research gaps, particularly in the critical area of research that supports decisions about responding to climate change.
Substantially reducing greenhouse gas emissions will require prompt and sustained efforts to promote major technological and behavioral changes, says Limiting the Magnitude of Future Climate Change, another of the new reports. Although limiting emissions must be a global effort to be effective, strong U.S. actions to reduce emissions will help encourage other countries to do the same. In addition, the U.S. could establish itself as a leader in developing and deploying the technologies necessary to limit and adapt to climate change.
An inclusive national policy framework is needed to ensure that all levels of government, the private sector, and millions of households and individuals are contributing to shared national goals. Toward that end, the U.S. should establish a greenhouse gas emissions “budget” that sets a limit on total domestic emissions over a set period of time and provides a clear, directly measurable goal. However, the report warns, the longer the nation waits to begin reducing emissions, the harder and more expensive it will likely be to reach any given emissions target.
We must manage and minimize the risks of climate change, says the third report, Adapting to the Impacts of Climate Change. Some impacts – such as rising sea levels, disappearing sea ice, and the frequency and intensity of some extreme weather events like heavy precipitation and heat waves – are already being observed across the country. The report notes that policymakers need to anticipate a range of possible climate conditions and that uncertainty about the exact timing and magnitude of impacts is not a reason to wait to act. In fact, it says boosting U.S. adaptive capacity now can be viewed as “an insurance policy against an uncertain future,” while inaction could increase risks, especially if the rate of climate change is particularly large.