UNITED NATIONS — Dramatic worldwide climate changes can no longer be avoided, but there is still time to stave off the worst consequences of global warming, an international research team said Tuesday.
The scientists from 11 countries urged sweeping conservation measures to hold the expected increase in temperatures to no more than an average of 3.6 degrees Fahrenheit -- less than half the expected increase if emissions of greenhouse gas and soot continue unabated.
Based on two years of study, the scientists called for bold actions, including carbon taxes, a ban on conventional coal-fired power plants and an end to beachfront construction worldwide.
The researchers were financed by the nonprofit United Nations Foundation and the 60,000-member research society Sigma Xi.
"Unlike many reports from scientists, this report gives very clear recommendations for what the international community and nations themselves must do to mitigate and adapt to climate change," said biodiversity expert Peter Raven, director of the Missouri Botanical Garden, who helped prepare a Sigma Xi study.
With its emphasis on policy recommendations, the panel's effort marks a shift in the international politics of pollution and climate change, analysts said. Researchers are no longer debating whether human-induced global warming is genuine, but have begun the painstaking process of negotiating international agreement on what to do about it.
Their effort comes on the heels of a landmark United Nations report last month that concluded rising temperatures would continue to increase even if greenhouse gas emissions could be held to current levels.
Global temperatures have increased about 1.4 degrees Fahrenheit over pre-industrial levels, the researchers said. To meet the scientists' goal, global CO2 emissions must level off by 2015 and drop by two-thirds of that level by 2100.
They urged stricter fuel efficiency standards, as well as fuel taxes, registration fees and rebates that favor more efficient transportation, which today is responsible for 40% of the world's carbon emissions.
A 20-fold improvement in car efficiency is well within existing technology, they said. Moving freight by rail instead of truck could also cut emissions substantially.
The researchers also recommended the expanded use of biofuels to reduce dependence on the oil that accounts for one-quarter of the world's CO2 emissions. They endorsed broader use of nuclear power, if it can be made safer. Energy research budgets worldwide ought to triple, they said.
