Bjorn Lomborg: Act wisely, not rashly, on climate crisis

COPENHAGEN, Denmark -- In speech after rousing speech at the United Nations summit on global warming last week, politicians emphasized the need to protect the world's most vulnerable, who will be hit hardest by climate change. The rhetoric did little to disguise an awful truth: If we continue on our current path, we are likely to harm the world's poorest much more than we help them.

Urged on by environmental activists, many politicians are vowing to make carbon cuts designed to keep expected temperature rises under 3.6 degrees (2 degrees Celsius). Yet it is nearly impossible for these promises to be fulfilled.

Japan's commitment in June to cut greenhouse gas levels 8 percent from its 1990 levels by 2020 was scoffed at for being far too little. Yet for Japan -- which has led the world in improving energy efficiency -- to have any hope of reaching its target, it needs to build nine new nuclear power plants, construct more than 1 million new wind turbines, install solar panels on nearly 3 million homes, double the percentage of new homes that meet rigorous insulation standards and increase sales of "green" vehicles from 4 percent to 50 percent of its auto purchases.

Japan's new prime minister was roundly lauded this month for promising a much stronger reduction, 25 percent, even though there is no obvious way to deliver on his promise. Expecting Japan, or any other nation, to achieve such far-fetched cuts is simply delusional.

Imagine for a moment that the fantasists win the day and that at the climate conference in Copenhagen in December every nation commits to reductions even larger than Japan's, designed to keep temperature increases under 2 degrees Celsius. The result would be a global price tag of $46 trillion in 2100, to avoid expected climate damage costing just $1.1 trillion, according to climate economist Richard Tol, a contributor to the Intergovernmental Panel on Climate Change whose cost findings were commissioned by the Copenhagen Consensus Center and are to be published by Cambridge University Press next year.

Yet the real tragedy is that, by exaggerating the threat of global warming, we have awoken the beast of protectionism. There are always forces in society that demand that politicians create more barriers to trade because they cannot compete on an even, fair playing field. Global warming has given them a much stronger voice.

Already, politicians are responding -- and using the fear of global warming to create "green fences" against free trade. The U.S. House has passed the Waxman-Markey climate change bill with clear provisions to impose new trade tariffs on countries that don't agree to emission reductions.

French President Nicolas Sarkozy has repeatedly called for a Europe-wide tax on imports from nations whose global warming efforts do not measure up to Europe's. German Chancellor Angela Merkel recently backed the idea.

There is a real and growing prospect of an all-out trade war being waged in the name of climate change.

This is a massive mistake. Economic models show that the global benefits of even slightly freer trade are in the order of $50 trillion -- 50 times more than we could achieve, in the best of circumstances, with carbon cuts. If trade becomes less free, poor nations -- the very countries that will experience the worst of climate damage -- would suffer most.

Today, coal accounts for almost half of the planet's electricity supply, including half the power consumed in the United States. It keeps hospitals and core infrastructure running, provides warmth and light in winter, and makes lifesaving air conditioning available in summer. In China and India, where coal accounts for more than 80 percent of power generation, it has helped to lift hundreds of millions of people out of poverty.

There is no doubt that coal is causing environmental damage that we need to stop. But a clumsy, radical halt to our coal use -- which is what promises of drastic carbon cuts actually require -- would mean depriving billions of people of a path to prosperity.

Bjørn Lomborg is director of the Copenhagen Consensus Center. He wrote this article for the Washington Post.