Want to read Slashdot from your mobile device? Point it at m.slashdot.org and keep reading!

 



Forgot your password?
typodupeerror
×

Comment Re:Last time I voted... (Score 1) 268

Across North America, the estimated number of migrating birds killed annually in collisions with buildings ranges from 100 million to 1 billion birds. - http://www.flap.org/faqs.php

Somewhere between 0.1 and 0.3 million birds die each year from collisions with wind turbines - http://www.smithsonianmag.com/...

But the real killer ... CATS! Cats may kill up to 3.7 billion birds and 20.7 billion mammals in the United States alone each year, a new study has found. - http://www.cbc.ca/news/technol...

Comment Re:Queue the deniers (Score 1) 387

You should read the paper. Geothermal sources are not thought to have changed over the last 100 (or 100,000) years. They cannot be the cause of recent Antarctic melting. However they could make the collapse come about all that much quicker.

It was recently reported that the west Antarctic ice sheet had hit a tipping point and would collapse completely in about 200 years after about 9000 years of stability. The models used to conclude this would not have taken into account the high geothermal sources under the antarctic. The date of collapse may need to be revised forward taking into account this new data.

So no, I don't think this study upends any existing science. It is just one more data point.

Comment Re:Let me get this straight (Score 1) 387

Contrarians have been predicting global cooling for decades. Who cares? They have been wrong for decades and will continue to be wrong. But I will one up your three nutty links with one of my own. If you are into the fringe you may also be interested these contrarians who can 'prove' that the Earth is the center of the universe, and that there is a great liberal conspiracy to keep this out of the journals: http://www.youtube.com/watch?v...

Comment Re:your theory on solar system warming? Aliens? (Score 2) 387

Earth is getting warmer because of radiative physics related to increased greenhouse gasses.

We don't have much more than a few data points on Martian temperatures, so it is not really possible to know whether there are any long term warming or cooling trends. Mars has no oceans and only a very thin atmosphere, which means there is very little thermal inertia. This makes Mars more susceptible to large swings in temperature. Orbital eccentricity contributes far greater changes to Martian climate than to that of the Earth because variations in Mars' orbit are five times greater than the Earth. Massive dust storms may also play a big role in changing the energy balance.

The only papers I can find on Venus indicate that it is likely cooling, but again, data points are sparse so it is inconclusive.

One thing is for certain. If they are warming, it is not because of a warming sun. We know this for sure because the sun has been cooling over the last 40 years.

Comment Re:Let me get this straight (Score 2) 387

The researchers mapped geothermal sources, but didn't find an increase in geothermal sources under the WAIS, Something else likely triggered the melting, but the geothermal sources may make this ice sheet more unstable than previously thought. This may explain why we hit the tipping point so much sooner than we had expected.

Comment Re:Queue the deniers (Score 3, Informative) 387

To be clear, the researchers did not find an increase in geothermal activity under the west Antarctic ice sheet, they just mapped sources of geothermal activity and found that there were significant sources. If the models do not take these into account they may greatly underestimate the rate of collapse.
Earth

Geothermal Heat Contributing To West Antarctic Ice Sheet Melting 387

bricko sends this news from The University of Texas at Austin: Thwaites Glacier, the large, rapidly changing outlet of the West Antarctic Ice Sheet, is not only being eroded by the ocean, it's being melted from below by geothermal heat, researchers at the Institute for Geophysics at The University of Texas at Austin (UTIG) report in the current edition of the Proceedings of the National Academy of Sciences. The findings significantly change the understanding of conditions beneath the West Antarctic Ice Sheet, where accurate information has previously been unobtainable. The Thwaites Glacier has been the focus of considerable attention in recent weeks as other groups of researchers found the glacier is on the way to collapse, but more data and computer modeling are needed to determine when the collapse will begin in earnest and at what rate the sea level will increase as it proceeds. The new observations by UTIG will greatly inform these ice sheet modeling efforts.

Comment What the science shows (Score 1) 41

Well, could trust a blog, or check the peer reviewed science?

What are the predictions of climate models, should we believe them, and are they falsifiable? Probably the most iconic and influential result arising from climate models is the prediction that, dependent on the rate of increase of CO2 emissions, global and annual mean temperature will rise by around 2–4C over the 21st century. We argue that this result is indeed credible, as are the supplementary predictions that the land will on average warm by around 50% more than the oceans, high latitudes more than the tropics, and that the hydrological cycle will generally intensify. Beyond these and similar broad statements, however, we presently find little evidence of trustworthy predictions at fine spatial scale and annual to decadal timescale from climate models. -- http://onlinelibrary.wiley.com...

Slashdot Top Deals

He has not acquired a fortune; the fortune has acquired him. -- Bion

Working...