If only gay sex caused global warming

Because we barely notice changes that happen gradually, we accept gradual changes that we would reject if they happened abruptly. The density of Los Angeles traffic has increased dramatically in the last few decades, and citizens have tolerated it with only the obligatory grumbling. Had that change happened on a single day last summer, Angelenos would have shut down the city, called in the National Guard and lynched every politician they could get their hands on.

Environmentalists despair that global warming is happening so fast. In fact, it isn't happening fast enough. If President Bush could jump in a time machine and experience a single day in 2056, he'd return to the present shocked and awed, prepared to do anything it took to solve the problem..

The human brain is a remarkable device that was designed to rise to special occasions. We are the progeny of people who hunted and gathered, whose lives were brief and whose greatest threat was a man with a stick. When terrorists attack, we respond with crushing force and firm resolve, just as our ancestors would have. Global warming is a deadly threat precisely because it fails to trip the brain's alarm, leaving us soundly asleep in a burning bed.

It remains to be seen whether we can learn to rise to new occasions.