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Global warming due to asphalt? - Page 2

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Posted by You on July 14, 2008, 9:21 pm
 


but you seem to be ignoring the FACT that the suns energy is only PART
of the Total Energy being dissipated in any one area.  Think of ALL the
electrical energy we pump into cities. Thousands of Megawatts. Where
does all that energy go? It goes up in HEAT, in the cities where it is
USED.  That heats the AIR in those cities, and that causes a Temp Rise
in cities that isn't there in rural areas. How much energy does a tree
dissipate, or grass, or small animals, compared to the amount of
electrical energy dissipated, per square mile, in a city? Duh......

Posted by J. Clarke on July 15, 2008, 2:26 am
 
You wrote:

Google "heat island".


--
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--John
to email, dial "usenet" and validate
(was jclarke at eye bee em dot net)



Posted by RF on July 23, 2008, 4:25 am
 You wrote:

With concreted or asphalted areas there should be
a certain minimum coverage with trees to provide
shade, reduce the overall heating effect, and make
it a more comfortable place to be.

Posted by T. Keating on July 18, 2008, 7:56 pm
 On Sun, 13 Jul 2008 16:52:51 -0700, "Steve"


Exponent error... that would be 2.6 gigawatts per square mile.



Posted by Steve on July 16, 2008, 2:11 am
 
I stand corrected.  Those nasty decimal places anyhow.

A few interesting statistics from:

http://www.solcomhouse.com/solarpower.htm

---
All the energy stored in Earth's reserves of coal, oil, and natural gas is
matched by the energy from just 20 days of sunshine.

In 40 minutes of daylight The SUN releases upon The Earth the amount of
energy that is consumed by the entire population of the planet in ONE YEAR.

Each day more solar energy falls to the Earth than the total amount of
energy the planet's 6 billion inhabitants would consume in 27 years.
---

If these statistics are true, I would not be a bit surprised if the "Heat
Island" effect is more significant than the greenhouse effect.  Of course
they are not independent, and the global effect of either are extremely hard
to measure with any certainty.

Regards,
Steve



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