AN INCREASINGLY DIM VIEW OF GLOBAL WARMING.Byline: David Kronke TV Critic
In case you haven't yet reached your limit on alarmist a·larm·ist
A person who needlessly alarms or attempts to alarm others, as by inventing or spreading false or exaggerated rumors of impending danger or catastrophe. information, tonight's "Nova" report, "Dimming the Sun," should help you surpass it quite handily hand·i·ly
1. In an easy manner.
2. In a convenient manner.
Adv. 1. handily - in a convenient manner; "the switch was conveniently located"
We've all heard about global warming global warming, the gradual increase of the temperature of the earth's lower atmosphere as a result of the increase in greenhouse gases since the Industrial Revolution. , which suggests that greenhouse gases have made the planet about a degree warmer than it was a century ago. Now comes global dimming Global dimming is the gradual reduction in the amount of global direct irradiance at the Earth's surface that was observed for several decades after the start of systematic measurements in 1950s. , a phenomenon that ostensibly os·ten·si·ble
Represented or appearing as such; ostensive: His ostensible purpose was charity, but his real goal was popularity. cools the Earth, but in fact has masked the rate at which global warming has actually been occurring.
Global dimming is the result of pollutants in the air deflecting the sun's rays away from the Earth. One scientist, Gerald Stanhill, wrote about it years ago, but the notion was considered so outlandish that his research was dismissed. In recent years, disparate other studies have confirmed it, and, in a bizarre twist, the terrorist attacks of Sept. 11, 2001, helped push research along.
David Travis of the University of Wisconsin charted America's climate in the days after 9/11, when all planes were grounded.
With jets' condensation trails eliminated from the country's skies, the temperature range days were warmer, nights were cooler was the largest swing in the past 30 years, he discovered.
So while the greenhouse effect greenhouse effect: see global warming.
Warming of the Earth's surface and lower atmosphere caused by water vapour, carbon dioxide, and other trace gases in the atmosphere. Visible light from the Sun heats the Earth's surface. has been warming the planet, global dimming has cooled it a bit, which means that global warming is occurring faster than anyone realized. And while particle pollutants have been reduced from our skies, amounts of greenhouse gases escaping into the air proceed apace. Which means the world could be 5 degrees hotter by midcentury or, by one scientist's particularly dire reckoning, by 2100, the temperature could be as much as 18 degrees warmer. And you do not want to know what that would mean.
"Dimming the Sun" explicates a lot of particularly confusing science succinctly and intelligently, and its message is undeniably sobering. But all this creates a bizarre conundrum conundrum A problem with no satisfactory solution; a dilemma : Pollution which causes health problems but does block the sun's rays is somehow good?
David Kronke, (818) 713-3638
DIMMING THE SUN - Three stars
What: "Nova" report with new information suggesting global warming may be even more dire than previously thought.
Where: KCET KCET Konami Computer Entertainment Tokyo (Japan)
KCET Kamaraj College of Engineering and Technology .
When: 8 tonight.
In a nutshell: Concise, informative and scary as hell.
Nova's ``Dimming the Sun,'' at 8 tonight on KCET, examines a lesser-known phenomenon that ostensibly cools the Earth and has masked the rate at which global warming occurs.