An uncertain future for soil carbon
A detailed knowledge of how carbon cycles through soils is crucial for predicting future atmospheric carbon dioxide concentrations.
A detailed knowledge of how carbon cycles through soils is crucial for predicting future atmospheric carbon dioxide concentrations.
Relative rates of temperature change between the troposphere and surface, and the mechanisms that produce these changes, have long been a contentious issue. Graversen et al.predicated upon the ERA-40 reanalysis, report polar tropospheric amplification of surface warming and attempt to explain this finding dynamically. (Brief Communications Arising)
On Show: A section of the audience watching the Oscar-winning film in Tiruchi. TIRUCHI: The Oscar-winning film,
Researchers confirm that surface temperatures in the Northern Hemisphere were warmer over the last 10 years than any time during the last 1,300 years, and, if the climate scientists include the somewhat controversial data derived from tree-ring records, the warming is anomalous for at least 1,700 years. The proxies used by the researchers included information from marine and lake sediment cores, ice cores, coral cores and tree rings. The study is published in the Proceedings of the National Academy of Sciences and is enclosed herewith.
A citizen
Global warming is inevitable. Therefore, the need is to develop strategies to reduce the greenhouse gases from the atmosphere. Carbon sequestration through biomass seems to be a cheap and viable option. There are several land-use options which can sequester carbon. Their potential of locking carbon differs not only with the type of species, but also with the agroclimatic zones. Hence, location-specific land-use systems need to be
The results of trend analyses of the discharge data of four rivers in northwestern Himalaya, namely Beas, Chenab, Ravi and Satluj, are presented here and the impact of climate change in the last century is discussed. In the case of Satluj river, studies indicate an episodic variation in discharge in all three seasons on a longer timescale of about 82 years (1922
Following the suggestions of a recent National Research Council
Who's best equipped to turn the White House green -- John McCain or Barack Obama? Both have made energy security and environmental stewardship part of their presidential campaigns. Both favor curbing the greenhouse gas emissions that spur climate change. Both say they want to stop US "addiction" to imported oil.
By ANDREW C. REVKIN Leading ice specialists in Europe and the United States for the first time have agreed that a ring of navigable waters has opened all around the fringes of the cap of sea ice drifting on the warming Arctic Ocean. By many expert accounts, this is the first time the Northwest Passage over North America and the Northern Sea Route over Europe and Asia have been open simultaneously in at least half a century, if not longer.
Richard Morgan AS ANNE GIBLIN was lugging four-foot tubes of Arctic lakebed mud from her inflatable raft to her nearby lab at the Toolik Field Station in Alaska this summer, she said,
Norway has begun seismic surveys at its biggest North Sea oil and gas field, Troll, to determine whether carbon dioxide emissions could be stored there, energy officials said on Friday.
PANJIM, SEPT 5
Modern humans may have started eliminating other species right from the start: our ancestors stand accused of wiping out megafauna - from giant flightless birds in Australia to mammoths in Asia and the ground sloth of North America - as they spread across the planet. Even so, by around 6000 years ago there were only about 12 million people on Earth - less than a quarter of the current population of Great Britain. That's a far cry from today's 6.6 billion, many of us guzzling fossil fuels, churning out greenhouse gases and messing with our planet's climate like there's no tomorrow.
How fast will our coastlines be swallowed up by rising sea levels?
US Northeast power companies likely will not race to buy permits to emit the main greenhouse gas in the country's first carbon auction later this month because the region's emissions of the gas have slipped over the last few years, experts said. The Regional Greenhouse Gas Initiative, a group of 10 states in the US Northeast that formed the first US greenhouse market, will regulate carbon dioxide emissions from power plants starting next year. It will hold its first auction for permits to pollute more than 12 million tons of emissions on Sept. 25.
The incredibly rapid rate at which Canada's Arctic ice shelves are disappearing is an early indicator of the "very substantial changes" that global warming will impose on all mankind, a top scientist said on Wednesday. Researchers announced late on Tuesday that the five ice shelves along Ellesmere Island in the Far North, which are more than 4,000 years old, had shrunk by 23 percent this summer alone. The largest shelf is disintegrating and one of the smaller shelves, covering 19 square miles (55 square km), broke away entirely last month.
As the world's oceans get warmer, the strongest tropical storms get stronger, climate scientists reported on Wednesday as the remnants of Hurricane Gustav spun out over the central United States. "If the seas continue to warm, we can expect to see stronger storms in the future," James Elsner of Florida State University said. "As far as this year goes, as a season, we did see the oceans warm and I think there's some reason to believe that that's the reason we're seeing the amount of activity we are."
OSLO - Rare outbreaks of plague in the United States seem to match climate shifts over the Pacific Ocean in a hint that global warming may make the region too hot and dry for the disease, scientists said on Wednesday. Feared as the "Black Death" of the 14th century that killed an estimated 50 million people, plague is still a threat mainly in Africa. The western United States has had 430 cases since 1950, or about seven per year.
Atlantic tropical cyclones are getting stronger on average, with a 30-year trend that has been related to an increase in ocean temperatures over the Atlantic Ocean and elsewhere. Over the rest