WORLD Princeton professors say we can beat global warming

Their solution is a list of already existing technologies and techniques.
Humanity has the hardware in hand to halt the rise in heat-trapping greenhouse gases it pumps into the atmosphere and forestall the worst effects of global warming projected for the end of this century.
The goal could be achieved within the next 50 years by more widespread use of a portfolio of at least 15 approaches -- from energy efficiency, solar energy and wind power to nuclear energy and the preservation or enhancement of "natural" sinks for carbon dioxide such as rain forests, or the conservation tillage techniques on farms worldwide, say two Princeton University researchers in a study published Friday.
The list of technologies has been around for years, the researchers acknowledge. But past studies, such as one conducted by five U.S. national laboratories four years ago, tended to focus on whether these approaches could be used to reach the emissions goals and deadlines in the 1997 Kyoto Protocol without trashing the economy, as some critics of the pact have warned.
Holding out for more research, Bush administration officials have argued that "we need a solution comparable to the discovery of electricity before we can get on with the carbon problem," says Robert Socolow, an engineering professor at Princeton University and co-director of the school's Carbon Mitigation Initiative. "But there isn't a [Michael] Faraday in every generation. If you don't get started, you'll waive an opportunity" to use what's available.
Study implications
The study, published in Friday's edition of the journal Science, is short on policy recommendations.
"How do you get these [technologies] into the system?" asks Eileen Claussen, president of the Pew Center on Global Climate Change and Strategies for the Global Environment in Arlington, Va. The problem, she says, is more one of politics and cost than whether key technologies currently exist at industrial scales.
Yet by adopting a more scientifically defensible target and a longer time scale to achieve it, Stephen Pacala and Socolow hope the study helps break a logjam -- at least in the United States -- over when to begin efforts to stabilize and ultimately reduce the carbon-dioxide emissions that most atmospheric scientists say are contributing to a warming world climate.
The duo argues that, applied globally, the approaches they identify could cap atmospheric CO2 concentrations at roughly 500 parts per million. This would be significantly lower than what is projected for 2100 if no actions are taken. And the means they have developed for analyzing the gap between business-as-usual emissions and the stable rate they seek -- and the plausibility of using existing approaches to reach them -- could help policy-makers choose among options.
Oceans growing acidic
The study's publication comes at a time when scientific research continues to build what many see as a case for action, even as it also aims to reduce the uncertainties that still surround the direct and indirect effects of humanity's industrial donations of carbon to the atmosphere.
In July, researchers published two studies in the journal Science, pointing to the oceans as the largest sink for atmospheric CO2 and measuring CO2's impact on the ocean carbon cycle. The results indicate that the oceans are becoming more acidic, which could endanger a range of marine life.
Meanwhile, climate models are teasing out the potential effects of climate change. Researchers at the National Center for Atmospheric Research in Boulder, Colo., report in Science that a "business as usual" buildup of CO2 in the atmosphere will intensify large-scale circulation patterns that bring heat waves to the Unite States and Europe. The results suggest that the southern and western United States would be among the regions hardest hit by frequent, long-lasting heat waves.

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