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From da_chee@... Sun Oct 26 23:49:11 2008
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Date: Mon, 27 Oct 2008 06:49:04 -0000
To: ClimateChangeAction@...
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From: "da_chee" <da_chee@...>
Subject: Re: Alternative thinking required
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Solar energy received from the sun not only increases the heat of an=20
object but is also used to change the shape of form of an object or=20
living things. An example is the use of solar energy to make food by=20
plant and as a result plants grow. These plants are then food for=20
animals of which we eat some of them or are eaten by other animals.
In countries where there are four seasons, solar energy is=20
important, without it many creatures cannot survive.=20
Though, solar energy in non-living things is mainly in the form of=20
heat and may be absorbed or transfer to its environment, the heat=20
energy is also transformed into other types of energy such as from=20
liquid to gas or change in shapes and further convert to energies=20
such as wind and wave. Living things converts solar energy into=20
other form such as kinitic energy use by creature for movement and=20
as well as chemical form stored in animals for future use or for=20
slow release back into the environment such as wood from tree.
So, solar energy is very important to earth and not only to be used=20
by human. If we start using solar energy for other than what it is=20
indented for by Nature, we begin depriving the rightful users of=20
solar energy and the start of climate change.
Inconclusion, it is important that we, human do not waste the energy=20
that is available at the moment. Though, some of these energies may=20
seem plentiful, inconsiderate use of them that are wasteful will be=20
to the destruction of the earth and mankind! These energies are to=20
be used by all living and non living things on earth in a balanced=20
manner and should not be over used by only the humans. So it is time=20
that we become more considerate and start wasting energy, be it=20
solar or others type of resources including food!
Regards,
David
--- In ClimateChangeAction@..., hugh spencer=20
<Hugh@...> wrote:
>
> OK - there is a basic misconception here...
>=20
> All energy that falls upon the earth from the sun - excluding that=20
which is
> directly reflected back as visible light - is adsorbed, and causes=20
whatever
> it is that adsorbed it to heat up. All objects that are warmer than
> absolute zero (-273.15=B0C) radiate energy as infra-red radiation.=20
The warmer
> they are - the more energy in the radiation (and the shorter the
> wavelength). An object that is warmer than its environment (say a=20
hot
> potato out of the fire) - will radiate infrared radiation (you can=20
feel
> that coming from the hot potato) - and this will continue until=20
such times
> the potato is the same temperature as its surroundings. At this=20
point, the
> radiation the potato emits is the same as that it receives from=20
the rest of
> the environment, all of which is radiating too, and it is then=20
in "thermal
> equilibrium with its environment" - and we say it has cooled to=20
ambient
> temperature.
>=20
> A piece of white-hot steel - is radiating in the visible region of=20
the
> spectrum (very hight radiant energy - loses a lot of heat very=20
fast) - and
> as it loses heat through radiation - it gets redder and darker -=20
and the
> wavelength of the energy emitted gets longer and longer - and the=20
radiant
> energy gets weaker and weaker.
>=20
> Conversely - any object that is cooler than its environment (a=20
bottle of
> coke left out of the fridge) will receive more radiation than it=20
emits -
> and will warm up - until it is in equilibrium.
>=20
> (you will notice that I have left out convection and conduction of=20
heat -
> we'll just concentrate on radiation - which operates everywhere -=20
even in a
> vacuum).
>=20
> It's this radiated infrared energy (from the earth's surface)=20
which is
> intercepted by CO2, water vapour and synthetic greenhouse gases -=20
and
> prevented from radiating back into space (so the earth's=20
temperature rises
> to a new higher equilibrium temperature - at which, again, energy=20
in =3D
> energy out. This is the basis of global warming..
>=20
> The energy collected by solar collectors obeys exactly the same=20
laws - the
> collectors heat up and re-radiate energy, the electricity that=20
they make
> generates, in the end, heat - which radiates. The captured energy=20
(by a
> solar collector) doesn't somehow become entrapped - (except very=20
briefly by
> charging batteries - or creating some high energy compounds - in=20
the end -
> the energy is released - and ends up as infrared radiation, same a=20
rock.
>=20
> The only exception to that has been the burning of fossil fuels -=20
where
> ancient trapped solar energy is being released - but the amount of=20
thermal
> energy we are speaking of is relatively miniscule - compared to=20
daily solar
> input. What IS causing the problem is the increase in CO2=20
released - and
> its shielding effect on radiated infrared energy from the earth's=20
surface.
>=20
> Hope this helps clarify things
>=20
> Hugh
>=20
>=20
>=20
>=20
>=20
> >Hugh,
> >
> >It is unfortunate that I do not have an understanding of basic
> >physics, nevertheless, you had answered the issue with your reply.
> >That we, humans had distorted the natural environment of the earth
> >and this is done through energy wastage resulting in an incomplete
> >natural transformation of the available energy on earth.
> >
> >It is not the amount of energy resources that is available but the
> >conversion of energy that creates an inbalance environment that
> >matters. Energy can be used naturally by the environment or
> >unnaturally by human.
> >
> >In simple term, if we are replacing fossil fuels with solar=20
energy,
> >it is estimated that 432.5EJ (energy used from fossil fuels in=20
2005:
> >from
>=20
>http://en.wikipedia.org/wiki/World_energy_resources_and_consumption)
> >is absorbed from the sun's ray on earth, which originally is
> >absorbed by the environment.
> >
> >With increasing energy usage by humans, more energy will be "taken
> >out" from the environment causing an inbalance situation and a
> >likely "climate change"
> >This is similar in concept with the displacement of fossil fuels
> >from under the ground into the earth's atmosphere.
> >
> >To avoid these situation, we should avoid excessive and wasteful
> >usage of these resources be it fossil fuels, solar or any other
> >alternaives.
> >
>
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