The Cause Of Global Warming
Arctic 'tipping point' may not be reached
Scientists say current concerns over a tipping point in the disappearance of Arctic sea ice may be misplaced.
Danish researchers analysed ancient pieces of driftwood in north Greenland which they say is an accurate way to measure the extent of ancient ice loss.
Writing in the journal Science , the team found evidence that ice levels were about 50% lower 5,000 years ago.
They say changes to wind systems can slow down the rate of melting.
They argue, therefore, that a tipping point under current scenarios is unlikely.
While modern observations by ship and by satellite give us a very accurate picture of the recent state of the ice, historic information is limited. The ice comes and goes without leaving a permanent record.
But a Danish team believes it has found an indirect method that gives a clear picture of the ice loss dating back 11,000 years.
Dr Svend Funder from the Natural History Museum of Denmark led several expeditions to inhospitable regions of Northern Greenland. On these frozen shores the Danish team noticed several pieces of ancient driftwood. They concluded that it could be an important method of unlocking the secrets of the ancient ice.
"Driftwood cannot float across the water, it has to be ferried across the ocean on ice, and this voyage takes several years, which means that driftwood is actually a signal of multi-year sea ice in the ocean and it is this ice that is at risk at the moment" said Dr Funder.
Carbon dating was used to determine the age of the wood. And figuring out its origins also yielded important information.
"It's so lovely that drift wood from Siberia is mainly larch and from North America is mainly spruce. So if we see there was more larch or spruce we can see that the wind system had changed and in some periods there was little spruce and in other periods there was lots," he said.
As well as the driftwood, the scientists mapped beach ridges for 500km (310 miles) along the coast. This proved that at one time the waves had reached the shore unhindered by the ice.
Dr Funder and his team say their data shows a clear connection between temperature and the amount of sea ice. The researchers concluded that for about 3,000 years, during a period called the Holocene Climate Optimum, there was more open water and far less ice than today - probably less than 50% of the minimum Arctic sea ice recorded in 2007.
The Cause Of Global Warming - News
Tim Pawlenty is chalking up global warming almost entirely to natural causes. The Republican presidential candidate who once cut commercials advocating for cap-and-trade legislation while serving as Minnesota governor told the Miami Herald this week
"I think the effect of temperature and global warming may cause a change in the general wind systems which maybe will delay the effects of the rapidly rising temperatures a little bit." The researchers are now set to examine DNA from the fossils of
Computations based on the theory of greenhouse effect show that increasing CO2 concentration results in cooling rather than warming. Today's [CO2] of ~390 parts per million (ppm) is a mere blip on the radar screen compared to earth's historic CO2
Carlson stated Wednesday “SpongeBob is talking a lot about global warming, and he's only looking at it from one point of view.” Yes, because, well, that is her job. The criticism stems from a July 20 Department of Education event called “Let's Read!
What that means is that we've only experienced about half of the warming that will be cause by the gases already in the atmosphere.” According to Hansen, that presents a major problem for several generations to come, as long as we continue to sweep the
What is the Primary Cause of Global Warming
What is the Primary Cause of Global Warming
In February 2007 the Intergovernmental Panel on Climate Change (IPCC) stated in its Fourth Assessment Report (90% or more likely), namely that human actions are causing global warming “very likely” 0.75 degrees indicated by the increase of average global temperature over the last 100 years. This statement is climate researchers whether human activity is the main cause of global warming at the global level among the thousands of results of very difficult negotiations.warming “lies” and “the biggest scandal of today.” Martin Durkin and coworkers argue that the result of scientific consensus on climate change “global multi-billion dollar industry, created by industrial allies against radical environmentalists, peddling scare stories to chase funding for and the complicit politicians and the media stand is supported by scientists. ” Documentary scientist, politician, economist, writer and others, the scientific consensus on anthropogenic (or man-made -) are skeptical about global warming showcases.this kind of event, cosmic rays are responsible for changes or variations in natural climate cycles.So-called “urban heat island effect” of a local warming leads to more structured areas, cities increased slightly due to the heat generated by the global increase in temperature, rather than show. Anyhow, this argument was confuted by the IPPC, indicating that the urban heat island effect of the global trend through 1990, with no more than 0.05 ° C (0.09 ° F) degrees.
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