Stephen Hawking on human extinction

Quote from Ricter:

I used to wonder myself if a runaway greenhouse effect, like Venus's, was possible here, ala the positive feedback loop you mention. But, do you think there is enough CO2 on Earth, in any entrapment that could realistically be released by us, to reach a comparable equilibrium? I realize that that much warming is not at all necessary for general crop failure.

Edit: I did find this, just poking around google...

http://mc-computing.com/qs/Global_Warming/Venus.html
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The real wildcard is methyl hydrates contained in large quantities in the deep sea and permafrost. These are much more powerful greenhouse gasses and are starting to sublimate out into the atmosphere with the rising temperatures. They were not included in the IPCC report and are a real worry. There is certainly already a positive feedback loop between temps and emissions of these. Large areas of upwellings have recently been found in a Arctic seas they and are releasing much more than previously thought.

That study you reference is really just a piece put out by a denier and has next to no credibility,that much is obvious. It is true however that earth would never be like Venus for some of the reasons mentioned within the piece.
 
It's not just an article, dumb ass. There is a whole host of research showing glacial cycles, etc. You need to broaden the data that you draw conclusions from beyond what the proponets of GW show you.

A good example is the hocky stick chart GW proponent scientests were using to claim "proof" of man made GW. Add a another 200 years of data to that chart and you draw a different conclusion. Overlay other long term charts like sun spots and and the real picture starts to appear.

This PDF provides some of the information to enlighten you.

http://www.petitionproject.org/gw_article/GWReview_OISM300.pdf
Quote from futurecurrents:

Oh I found that Ice Age article. Guess what? It's on Fox News!!

Wow what a surprise!

http://nation.foxnews.com/human-car...s-could-put-lethal-new-ice-age-say-scientists

and it's such an extensive well researched piece ...!

It's almost as it they have an agenda !

Feed the flock.
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Quote from futurecurrents:

Wow. So if 98 out of 100 doctors tell you need surgery you would just ignore them? Are you a climatologist? Can you understand the simple fact that CO2 is 36% higher than it was two hundred years ago? Do you know what greenhouse gas means? I have a degree in Environmental Science so don't try to tell me I don't know about the science. Ice age? Iceball earth? Ha! Gimme a break ! Talk about ignorance! Maybe you should read this....
http://www.ncdc.noaa.gov/oa/climate/globalwarming.html
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Physics degree from USC (ranked #11).

You are an idiot.

Next.
 
Quote from futurecurrents:

The real wildcard is methyl hydrates contained in large quantities in the deep sea and permafrost. These are much more powerful greenhouse gasses and are starting to sublimate out into the atmosphere with the rising temperatures. They were not included in the IPCC report and are a real worry. There is certainly already a positive feedback loop between temps and emissions of these. Large areas of upwellings have recently been found in a Arctic seas they and are releasing much more than previously thought.

That study you reference is really just a piece put out by a denier and has next to no credibility,that much is obvious. It is true however that earth would never be like Venus for some of the reasons mentioned within the piece.
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Based on what I'm reading lately, we really don't need a major increase in surface temps, and it does not have to be "forever", in the sense that Man has ended the heating/cooling cycle. The crop killing heating only has to be a few years long to spell disaster. The population is far higher than before, and the food reserves, the pipeline inventory, is very low. Not to mention our present degree of urbanization.
 
Quote from futurecurrents:

... I have a degree in Environmental Science...
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What does one do for a career with a degree in environmental science anyway?

Waste disposal maybe?

:D
 
Quote from Lucrum:

What does one do for a career with a degree in environmental science anyway?

Waste disposal maybe?

:D
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Or work for the Obama administration spreading pseudoscience lies.
 
The hockey stick graph is valid, no matter how many years you add on. This was just recently proven with a re-examination of the data, ironically funded by the Koch bros. Of course we won't hear this on Fox. Temps and CO2 have skyrocketed over the last two hundred years. The CO2 is man-made, proven through isotope analysis. Malkovitch cycles or will eventually lead to a new ice age but that is hundreds of thousands of years in the future. Usually, rational people want to look at closer time frames.

Changes in ocean currents may occur that may lead to cooling of certain areas of the globe. These ocean current changes would be caused by global warming. This is one minor theory that has some credibility but changes nothing for the world as a whole.

Sunspots, while being a favorite fall-back for the deniers are simply not powerful enough or lengthy enough in duration to have a long term effect. Since they occur in 11 year cycles their influence is easily determined.




Quote from pspr:

It's not just an article, dumb ass. There is a whole host of research showing glacial cycles, etc. You need to broaden the data that you draw conclusions from beyond what the proponets of GW show you.

A good example is the hocky stick chart GW proponent scientests were using to claim "proof" of man made GW. Add a another 200 years of data to that chart and you draw a different conclusion. Overlay other long term charts like sun spots and and the real picture starts to appear.

This site provides some of the information to enlighten you.

http://www.petitionproject.org/review_article.php
More...
 
Quote from futurecurrents:

... Malkovitch cycles or will eventually lead to a new ice age ...
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Sounds like we should just let nature run it course.
 
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