Plenty of studies have shown that the Arctic is warming and that the ice caps are melting, but how does it compare to the past, and how serious is it?
New research shows that average summer temperatures in the Canadian Arctic over the last century are the highest in the last 44,000 years, and perhaps the highest in 120,000 years.
"The key piece here is just how unprecedented the warming of Arctic Canada is," Gifford Miller, a researcher at the University of Colorado, Boulder, said in a joint statement from the school and the publisher of the journal Geophysical Researcher Letters, in which the study by Miller and his colleagues was published online this week. "This study really says the warming we are seeing is outside any kind of known natural variability, and it has to be due to increased greenhouse gases in the atmosphere."
Miller and his colleagues gauged Arctic temperatures by looking at gas bubbles trapped in ice cores (cylinders drilled from the ice that show layers of snow laid down over time) taken from the region, which allows scientists to reconstruct past temperature and levels of precipitation. They paired this with radiocarbon dating of clumps of moss taken from a melting ice cap on Canada's Baffin Island. Their analysis shows that these plants have been trapped in the ice for at least 44,000 years, and perhaps as long as 120,000 years. Taken together, that data suggest temperatures in the region haven't been this high since perhaps as long as 120,000 years ago, according to the study.
The Arctic has been heating up for about a century, but the most significant warming didn't start until the 1970s, Miller said in the statement. "And it is really in the past 20 years that the warming signal from that region has been just stunning," he added. "All of Baffin Island is melting, and we expect all of the ice caps to eventually disappear, even if there is no additional warming."
During the last interglacial period Greenland was ice free in many areas that are now covered by several kilometers of ice. Scientists have drilled down below the ice and found DNA remnants of vegetation and insects that once thrived there in a forest that was probably similar to forests in Sweden of today.
We are nowhere near the lowest ice packs ever...and earth has undergone such dramatic shifts in ice and climate over the past several glacial periods, that in some decades changes in ice would have to have been very dramatic.
pud: Let me clue you in since you don't know. The Earth has been warming for 1000's of years. That's the reason Minnesota is longer covered in ice. In order for the ice to retreat over the Minnesota, the Earth's temps had to rise. is this really that confusing to you?? And, the oceans have also risen several hundreds of feet.
I don't understand why this is such a surprise to you. You act like the shyt happened overnight..
What you constantly and willfully continue to be ignorant of is the element of time. Geologic processes that took place over hundreds of thousands of years are one thing..climatic shifts that take place over decades on a planet with billions of hungry people is another. Oceans that rose 200' when no one was around was on thing, seas that rise meters when most humans live within 100 miles of the coast is another. Chemistry is also not one of your strong suits is it? Acidification and the altering of the marine eco systems that we all require to exist do in fact matter. Altering of soil chemistry, rainfall patterns, drought cycles, desertification etc do in fact matter to billions of humans and the ecosystems they rely on...It really is hard for me to understand how anyone could be as willfully stupid as you are and so public about it
Here is a scientific fact for yas
Scientists have found that the public will believe almost anything that is represented as being agreed by “scientists”, provided that you have enough of them and they are backed up by the requisite number of celebrities and public figures."
The IPCC have been going on long enough for it to become obvious that their models do not work. For example, their doctored “global temperature record” has shown no increase for 17 years in spite of the usual increase in carbon dioxide. They have tried to find desperate measures to cover this up by claims that it did not happen."
When the evidence Contradicts , unless you like looking like a Twin, you must Cease and Desist.....
Climate Science is a lot like Political Science.
The people that study these things all give each other awards and credit for coming up with the most fantastic story. Disney and Sony are always looking to these kooks for ideas to create new adventures rides and movies. Global warming has been a big seller lately.
In the IPCC's 3rd report the issue of natural variability was still considered a viable variable But by the 4th report they imposed severe discipline on the writers, and it really paid off. They concluded that human carbon dioxide emissions were the cause of a global warming threat, and were rewarded, along with Al Gore, with a Nobel Prize for their pains."
Al Gore may not have invented the internet but he did invent global warming.
Sorry guy ... risk / uncertainty management and THE NATURAL un NEA brainwashed nature of pro growth genetic driven anti holier than thou anti authoritarianism pro human nature demands PLANET HACKING geo-enginering NOT SOCIAL ENGINEERING ..... #$%$ and good night to your '60s old school Eco-Socialism