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Gray believes in the obs. The observations. Direct measurements. Numerical models can't be trusted. Equation pushers with fancy computers aren't the equals of scientists who fly into hurricanes.
"Few people know what I know. I've been in the tropics, I've flown in airplanes into storms. I've done studies of convection, cloud clusters and how the moist process works. I don't think anybody in the world understands how the atmosphere functions better than me."
In just three, five, maybe eight years, he says, the world will begin to cool again.
We sit in his office for 2 1/2 hours, until the sun drops behind the mountains, and when we're done he offers to keep talking until midnight. He is almost desperate to be heard. His time is short. He is 76 years old. He is howling in a maelstrom.
HUMAN BEINGS ARE PUMPING GREENHOUSE GASES INTO THE ATMOSPHERE, warming the planet in the process.
Since the dawn of the industrial era, atmospheric carbon dioxide has risen steadily from about 280 to about 380 parts per million. In the past century, the average surface temperature of Earth has warmed about 1 degree Fahrenheit. Much of that warming has been in the past three decades. Regional effects can be more dramatic: The Arctic is melting at an alarming rate. Arctic sea ice is 40 percent thinner than it was in the 1970s. Glaciers in Greenland are speeding up as they slide toward the sea. A recent report shows Antarctica losing as much as 36 cubic miles of ice a year.
The permafrost is melting across broad swaths of Alaska, Canada and Siberia. Tree-devouring beetles, common in the American Southwest, are suddenly ravaging the evergreen forests of British Columbia. Coral reefs are bleaching, scalded by overheated tropical waters. There appear to have been more strong hurricanes and cyclones in recent decades, Category 3 and higher -- such as Katrina.
The 1990s were the warmest decade on record. The year 1998 set the all-time mark. This decade is on its way to setting a new standard, with a succession of scorchers. The United Nations' Intergovernmental Panel on Climate Change, a global effort involving hundreds of climate scientists and the governments of 100 nations, projected in 2001 that, depending on the rate of greenhouse gas emissions and general climate sensitivities, the global average temperature would rise 2.5 to 10.4 degrees Fahrenheit between 1990 and 2100. Sea levels could rise just a few inches, or nearly three feet.
All of the above is part of the emerging, solidifying scientific consensus on global warming -- a consensus that raises the urgent political and economic issue of climate change. This isn't a theory anymore. This is happening now. Business as usual, many scientists say, could lead to a wildly destabilized climate for the first time since the dawn of human civilization.
But when you step into the realm of the skeptics, you find yourself on a parallel Earth.
It is a planet where global warming isn't happening -- or, if it is happening, isn't happening because of human beings. Or, if it is happening because of human beings, isn't going to be a big problem. And, even if it is a big problem, we can't realistically do anything about it other than adapt.
Certainly there's no consensus on global warming, they say. There is only abundant uncertainty. The IPCC process is a sham, a mechanism for turning vague scientific statements into headline-grabbing alarmism. Drastic actions such as mandated cuts in carbon emissions would be imprudent. Alternative sources of energy are fine, they say, but let's not be naive. We are an energy-intensive civilization. To obtain the kind of energy we need, we must burn fossil fuels. We must emit carbon. That's the real world.