Chill out.

The Kyoto Protocol, with its drastic emissions cuts, is not a sensible way to stop people from dying in future heat waves. At a much lower cost, urban designers and politicians could lower temperatures more effectively by planting trees, adding water features and reducing the amount of asphalt in at-risk cities. Estimates show that this could reduce the peak temperatures in cities by more than 20 degrees Fahrenheit.

Global warming will claim lives in another way: by increasing the number of people at risk of catching malaria by about 3 percent over this century. According to scientific models, implementing the Kyoto Protocol for the rest of this century would reduce the malaria risk by just 0.2 percent.

On the other hand, we could spend $3 billion annually -- 2 percent of the protocol's cost -- on mosquito nets and medication and cut malaria incidence almost in half within a decade. Malaria death rates are rising in sub-Saharan Africa, but this has nothing to do with climate change and everything to do with poverty: Poor and corrupt governments find it hard to implement and fund the spraying and the provision of mosquito nets that would help eradicate the disease. Yet for every dollar we spend saving one person through policies like the Kyoto Protocol, we could save 36,000 through direct intervention.

Of course, it's not just humans we care about. Environmentalists point out that magnificent creatures such as polar bears will be decimated by global warming as their icy habitat melts. Kyoto would save just one bear a year. Yet every year, hunters kill 300 to 500 polar bears, according to the World Conservation Union. Outlawing this slaughter would be cheap and easy -- and much more effective than a worldwide pact on carbon emissions.

Wherever you look, the inescapable conclusion is the same: Reducing carbon emissions is not the best way to help the world. I don't point this out merely to be contrarian. We do need to fix global warming in the long run. But I'm frustrated at our blinkered focus on policies that won't achieve it.

In 1992, wealthy nations promised to cut emissions to 1990 levels by 2000. Instead, emissions grew by 12 percent. In 1997, they promised to cut emissions to about 5 percent below 1990 levels by 2010. Yet levels will likely be 25 percent higher than hoped for.

The Kyoto Protocol is set to expire in 2012. U.N. members will be negotiating its replacement in Copenhagen by the end of 2009. Politicians insist that the "next Kyoto" should be even tougher. But after two spectacular failures, we have to ask whether "let's try again, and this time let's aim for much higher reductions" is the right approach.

Even if the policymakers' earlier promises had been met, they would have done virtually no good, but would have cost us a small fortune. The climate models show that Kyoto would have postponed the effects of global warming by seven days by the end of the century. Even if the United States and Australia had signed on and everyone stuck to Kyoto for this entire century, we would postpone the effects of global warming by only five years.

Proponents of pacts such as Kyoto want us to spend enormous sums of money doing very little good for the planet a hundred years from now. We need to find a smarter way. The first step is to start focusing our resources on making carbon emissions cuts much easier.

The typical cost of cutting a ton of CO2is currently about $20. Yet, according to a wealth of scientific literature, the damage from a ton of carbon in the atmosphere is about $2. Spending $20 to do $2 worth of good is not smart policy. It may make you feel good, but it's not going to stop global warming.

We need to reduce the cost of cutting emissions from $20 a ton to, say, $2. That would mean that really helping the environment wouldn't just be the preserve of the rich but could be opened up to everyone else -- including China and India, which are expected to be the main emitters of the 21st century but have many more pressing issues to deal with first.

The way to achieve this is to dramatically increase spending on research and development of low-carbon energy. Ideally, every nation should commit to spending 0.05 percent of its gross domestic product exploring non-carbon-emitting energy technologies, be they wind, wave or solar power, or capturing CO2emissions from power plants. This spending could add up to about $25 billion per year but would still be seven times cheaper than the Kyoto Protocol and would increase global R&D tenfold. All nations would be involved, yet the richer ones would pay the larger share.