Global Warming: Future Temperatures Could Exceed Livable Limits

Go down

Global Warming: Future Temperatures Could Exceed Livable Limits

Post by Future In Your Hands on Wed May 08, 2013 8:55 am

Global Warming: Future Temperatures Could Exceed Livable Limits, Researchers Find - Cut your excessive consumption and reduce your carbon footprint NOW!

There is a balance and we are tipping it against the planet by releasing greenhouse gasses that were sequestered underground for millions of years trapped in gas and oil. Every time you buy some imported plastic junk you are buying the carbon footprint that brought that product around the world. The cost in emissions from fuel to ship this junk is HUGE, not to mention all the toxins released in the manufacture of such products. Become a minimalist NOW and encourage others to do the same VIA your social media. The more PPL cutting back the less CO2 and other greenhouse gasses in the atmosphere. Read this shocking article by leading scientists!

May 5, 2010 — Reasonable
worst-case scenarios for global warming could lead to deadly
temperatures for humans in coming centuries, according to research
findings from Purdue University and the University of New South Wales,
Researchers for the first time have calculated the highest tolerable
"wet-bulb" temperature and found that this temperature could be exceeded
for the first time in human history in future climate scenarios if
greenhouse gas emissions continue at their current rate.

Wet-bulb temperature is equivalent to what is felt when wet skin is
exposed to moving air. It includes temperature and atmospheric humidity
and is measured by covering a standard thermometer bulb with a wetted
cloth and fully ventilating it.
The researchers calculated that humans and most mammals, which have
internal body temperatures near 98.6 degrees Fahrenheit, will experience
a potentially lethal level of heat stress at wet-bulb temperature above
95 degrees sustained for six hours or more, said Matthew Huber, the
Purdue professor of earth and atmospheric sciences who co-authored the
paper that will be published in the Proceedings of the National Academy of Sciences.

"Although areas of the world regularly see temperatures above 100
degrees, really high wet-bulb temperatures are rare," Huber said. "This
is because the hottest areas normally have low humidity, like the 'dry
heat' referred to in Arizona. When it is dry, we are able to cool our
bodies through perspiration and can remain fairly comfortable. The
highest wet-bulb temperatures ever recorded were in places like Saudi
Arabia near the coast where winds occasionally bring extremely hot,
humid ocean air over hot land leading to unbearably stifling conditions,
which fortunately are short-lived today."

The study did not provide new evaluations of the likelihood of future
climate scenarios, but explored the impacts of warming. The challenges
presented by the future climate scenarios are daunting in their scale
and severity, he said.

"Whole countries would intermittently be subject to severe heat
stress requiring large-scale adaptation efforts," Huber said. "One can
imagine that such efforts, for example the wider adoption of air
conditioning, would cause the power requirements to soar, and the
affordability of such approaches is in question for much of the Third
World that would bear the brunt of these impacts. In addition, the
livestock on which we rely would still be exposed, and it would make any
form of outside work hazardous."

While the Intergovernmental Panel on Climate Change central estimates
of business-as-usual warming by 2100 are seven degrees Fahrenheit,
eventual warming of 25 degrees is feasible, he said.
"We found
that a warming of 12 degrees Fahrenheit would cause some areas of the
world to surpass the wet-bulb temperature limit, and a 21-degree warming
would put half of the world's population in an uninhabitable
environment," Huber said. "When it comes to evaluating the risk of
carbon emissions, such worst-case scenarios need to be taken into
account. It's the difference between a game of roulette and playing
Russian roulette with a pistol. Sometimes the stakes are too high, even
if there is only a small chance of losing."

Steven Sherwood, the professor at the Climate Change Research Centre
at the University of New South Wales, Australia, who is the paper's lead
author, said prolonged wet-bulb temperatures above 95 degrees would be
intolerable after a matter of hours.

"The wet-bulb limit is basically the point at which one would
overheat even if they were naked in the shade, soaking wet and standing
in front of a large fan," Sherwood said. "Although we are very unlikely
to reach such temperatures this century, they could happen in the next."

Humans at rest generate about 100 watts of energy from metabolic
activity. Wet-bulb temperature estimates provide upper limits on the
ability of people to cool themselves by sweating and otherwise
dissipating this heat, he said. In order for the heat dissipation
process to work, the surrounding air must be cooler than the skin, which
must be cooler than the core body temperature. The cooler skin is then
able to absorb excess heat from the core and release it into the
environment. If the wet-bulb temperature is warmer than the temperature
of the skin, metabolic heat cannot be released and potentially dangerous
overheating can ensue depending on the magnitude and duration of the
heat stress.

The National Science Foundation-funded research investigated the
long-term implications of sustained greenhouse gas emissions on climate
extremes. The team used climate models to compare the peak wet-bulb
temperatures to the global temperatures for various climate simulations
and found that the peak wet-bulb temperature rises approximately 1
degree Centigrade for every degree Centigrade increase in tropical mean

Huber did the climate modeling on supercomputers operated by
Information Technology at Purdue (ITaP), Purdue's central information
technology organization. Sherwood performed the wet-bulb calculations.

"These temperatures haven't been seen during the existence of
hominids, but they did occur about 50 million years ago, and it is a
legitimate possibility that the Earth could see such temperatures
again," Huber said. "If we consider these worst-case scenarios early
enough, perhaps we can do something to address the risk through
mitigation or new technological advancements that will allow us to


Story Source:

The above story is reprinted from materials provided by Purdue University. The original article was written by Elizabeth K. Gardner.
Future In Your Hands

Posts : 2
Join date : 2013-05-08
Location : Austin, TX

Back to top Go down

Back to top

Permissions in this forum:
You cannot reply to topics in this forum