MISSOULA, Mont.—U.S. forests offset roughly 11 percent of the nation's industrial greenhouse gas emissions, storing "significant amounts" of carbon that would otherwise pollute the atmosphere, according to new government data.
The findings, released last week, estimate the nation's expanding forests sequester an additional 192 million metric tons of carbon annually due to increases in both the total area of forest land and the amount of carbon stored per acre.
That's the equivalent of removing about half the cars on the roads nationwide, or almost 135 million vehicles.
But as emissions increase and the planet warms, that storage capacity could be compromised, scientists warn.
Warmer summers, changing precipitation patterns and a thinning snow pack are already "aridifying" Western forests, University of Montana Professor Steven Running said during a conference here last week. The combination imperils the health of vast swathes of the western landscape, he warned.
"We think of range as having a 'carrying capacity' - you put too many cows on a pasture and they all get skinny because they don't have enough to eat," he said at a meeting of the Society of Environmental Journalists. "It's the same principle for our forests."
In 40 years, for instance, Montana will likely see 5ºF warmer summers on average but receive 10 percent less rainfall, he said. "We're aridifying our forests."
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But for now, the trend in carbon sequestration across the nation is up, according to the U.S. Forest Service data. On average, the agency said, the amount of carbon stored in forestland has increased since 1990.
Wet, temperate conifer forests along the Pacific Coast from Alaska to California store the most carbon - about 93 metric tons of carbon per acre. Arid pinyon-juniper forests of the Southwest store the least - 31 tons of carbon per acre on average.
Forests in the western United States store a greater proportion of carbon in the trees; other areas, such as the Great Lakes, have larger concentrations of peat in the soil, storing more carbon there.
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Understanding those differences - and corresponding climate-induced changes - could have important ramifications as the agency assesses the carbon sequestration potential of the nation's forests, agency officials said.
"Forest management on all lands can contribute significantly toward cooling a warming planet," U.S. Agriculture Secretary Tom Vilsack said in a statement. "This new information will assist the public and policy makers as we work to address this significant issue."
DailyClimate.org is a nonprofit news service that covers climate change.
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my, as are the badges. This black Holden Commodore someone else on the road is a regular HSV GTS, the 6.0-liter V-8-sport sedan of GM's Australian hot shop, built Holden special vehicles (HSV). With 20-inch wheels, big brakes, and tied-down suspension HSV GTS previews of the 425 hp Pontiac G8 GXP we here sometime will see in the late 2008.Under of Hood, though, is a little secret-a 7.0 L 505 hp LS7 V 8 directly lifted from the Corvette Z06. Yup, it's basically screws directly into. And an outsider, the operation to do, the GM has to run many Aussie Musclecar enthusiasts have been waiting for. The work done vehicles (CSV) in Melbourne, Australia, a tuner with no small amount of experience in turning was of Corsa specialized some evil Commodore-based stories in the last 15 years or so .we have the car dangers: run it down drag strip, peak hour traffic and out in the country, so can attest that the engineering, the finish and most all performance beautiful work. All it is needed a new badge now.\CartyStudios Corporation\Auto Blogging Software - WebMagnates.org\data\Car Talk - Everything About CARS!\MotorTrend News\112_0712_03z+HSV_GTS+engine.jpg)
Worth just hunting cut and talk about the acceleration. There is a six-speed automatic transmission involved but experience on the road suggests that, even with gummierter-Up track surface, traction of the line is not only difficult, it is almost not existent. The LS7 show lb-ft, Chevrolet numbers grunt, 470 but in this example, with a better feed intake and exhaust system certainly produced even more so, a couple of standard do, 20 Bridgestone tyres have if the chance is that the lot in Wrath Unleashed? Holden's traction and stability control is left to sort it out. Load up the torque converter, then... Wham! The GTS stutter a bit on the software, then hook and catapults down the track. A few seconds manual that shift the 6L80E transfer seems to work best, but there scratching head if the first-to-second circuit of the Rev limiter, is how the shift software finds it difficult to match the rapid escalation in lean operation. The answer is it in drive for the first layer, then change goals for the manual shift in the third and fourth to leave with approximately 6500 of the available 7,200 rpm. Work that much from, and each version is repeatable and trouble free last like that.\CartyStudios Corporation\Auto Blogging Software - WebMagnates.org\data\Car Talk - Everything About CARS!\MotorTrend News\112_0712_11z+HSV_GTS+at_track.jpg)
Results? Pretty spectacular for a sedan of less than half of the price of equivalent muscle from Germany. 0-62 Mph is 4.89 seconds; The standing 400 metres (14 ft short by one quarter mile) takes 12.90 seconds at terminal 116.2 mph. But then there are to consider some other numbers. The standing 125 mph-- achieve a speed are few cars able, in less than 500 metering-14.7 seconds, and the 7.0 litre GTS is still hard drag. But then there is the elasticity is the offered to all the torque. Click increment is demolished in third gear that pass 50-75 mph in 3.2 seconds, but in the sixth (the car's manual shift mode allows no Kick-Down) the same speed range is covered in 7.3 seconds.\CartyStudios Corporation\Auto Blogging Software - WebMagnates.org\data\Car Talk - Everything About CARS!\MotorTrend News\112_0712_05z+LS7_engine+.jpg)
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Sum up: a budget BMW 5-series. Seriously.Motor trend assessment: 
