$50 trillion to save $1 trillion?

Here’s Bjorn Lomborg, author of The Skeptical Environmentalist:

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 will 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. That phenomenal cost, calculated by all the main economic models, assumes that politicians across the globe will make the most effective, efficient choices. In the real world, where policies have many other objectives and legislation is easily filled with pork and payoffs, the deal easily gets worse.

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. Eyes are on the Senate, where John Kerry sees these as “sanctions” against “renegade countries.”

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.

The struggle to generate international agreement on a carbon deal has created a desire to punish “free riders” who do not sign on to stringent carbon emission reduction targets. But the greater goals seem to be to barricade imports from China and India, to tax companies that outsource, and to go for short-term political benefits, destroying free trade.

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, we could easily lose $50 trillion — or much more if we really bungle things. Poor nations — the very countries that will experience the worst of climate damage — would suffer most.

In other words: In our eagerness to avoid about $1 trillion worth of climate damage, we are being asked to spend at least 50 times as much — and, if we hinder free trade, we are likely to heap at least an additional $50 trillion loss on the global economy.