Home | Community | Message Board

Fairy Ring Spores
Please support our sponsors.

General Interest >> Political Discussion

Welcome to the Shroomery Message Board! You are experiencing a small sample of what the site has to offer. Please login or register to post messages and view our exclusive members-only content. You'll gain access to additional forums, file attachments, board customizations, encrypted private messages, and much more!

Amazon Shop for: Portable Greenhouse

Jump to first unread post. Pages: 1
Not an EggshellWalker
 User Gallery

Registered: 07/18/03
Posts: 7,991
Loc: Cave of the Patriarchs
Global Warming May Have More Current Affects than Previously Thought
    #3632966 - 01/15/05 10:56 PM (11 years, 9 months ago)

Why the Sun seems to be 'dimming'
By David Sington

The Sun
Scientists have been studying solar measurements for decades
We are all seeing rather less of the Sun, according to scientists who have been looking at five decades of sunlight measurements.

They have reached the disturbing conclusion that the amount of solar energy reaching the Earth's surface has been gradually falling.

Paradoxically, the decline in sunlight may mean that global warming is a far greater threat to society than previously thought.

The effect was first spotted by Gerry Stanhill, an English scientist working in Israel.

Cloud changes

Comparing Israeli sunlight records from the 1950s with current ones, Dr Stanhill was astonished to find a large fall in solar radiation.

"There was a staggering 22% drop in the sunlight, and that really amazed me." Intrigued, he searched records from all around the world, and found the same story almost everywhere he looked.

Sunlight was falling by 10% over the USA, nearly 30% in parts of the former Soviet Union, and even by 16% in parts of the British Isles.

Although the effect varied greatly from place to place, overall the decline amounted to one to two per cent globally every decade between the 1950s and the 1990s.

Dr Stanhill called it "global dimming", but his research, published in 2001, met a sceptical response from other scientists.

It was only recently, when his conclusions were confirmed by Australian scientists using a completely different method to estimate solar radiation, that climate scientists at last woke up to the reality of global dimming.

My main concern is global dimming is also having a detrimental impact on the Asian monsoon ... We are talking about billions of people
Professor Veerhabhadran Ramanathan
Dimming appears to be caused by air pollution.

Burning coal, oil and wood, whether in cars, power stations or cooking fires, produces not only invisible carbon dioxide - the principal greenhouse gas responsible for global warming - but also tiny airborne particles of soot, ash, sulphur compounds and other pollutants.

This visible air pollution reflects sunlight back into space, preventing it reaching the surface. But the pollution also changes the optical properties of clouds.

Because the particles seed the formation of water droplets, polluted clouds contain a larger number of droplets than unpolluted clouds.

Recent research shows that this makes them more reflective than they would otherwise be, again reflecting the Sun's rays back into space.

Scientists are now worried that dimming, by shielding the oceans from the full power of the Sun, may be disrupting the pattern of the world's rainfall.

There are suggestions that dimming was behind the droughts in sub-Saharan Africa which claimed hundreds of thousands of lives in the 1970s and 80s.

There are disturbing hints the same thing may be happening today in Asia, home to half the world's population.

"My main concern is global dimming is also having a detrimental impact on the Asian monsoon," says Professor Veerhabhadran Ramanathan, professor of climate and atmospheric sciences at the University of California, San Diego. "We are talking about billions of people."

Alarming energy

But perhaps the most alarming aspect of global dimming is that it may have led scientists to underestimate the true power of the greenhouse effect.

They know how much extra energy is being trapped in the Earth's atmosphere by the extra carbon dioxide we have placed there.

What has been surprising is that this extra energy has so far resulted in a temperature rise of just 0.6 degree Celsius.

This has led many scientists to conclude that the present-day climate is less sensitive to the effects of carbon dioxide than it was, say, during the ice age, when a similar rise in CO2 led to a temperature rise of six degrees Celsius.

But it now appears the warming from greenhouse gases has been offset by a strong cooling effect from dimming - in effect two of our pollutants have been cancelling each other out.

This means that the climate may in fact be more sensitive to the greenhouse effect than previously thought.

If so, then this is bad news, according to Dr Peter Cox, one of the world's leading climate modellers.

As things stand, CO2 levels are projected to rise strongly over coming decades, whereas there are encouraging signs that particle pollution is at last being brought under control.

"We're going to be in a situation unless we act where the cooling pollutant is dropping off while the warming pollutant is going up.

"That means we'll get reducing cooling and increased heating at the same time and that's a problem for us," says Dr Cox.

Even the most pessimistic forecasts of global warming may now have to be drastically revised upwards.

That means a temperature rise of 10 degrees Celsius by 2100 could be on the cards, giving the UK a climate like that of North Africa, and rendering many parts of the world uninhabitable.

That is unless we act urgently to curb our emissions of greenhouse gases.

For all of you who previously said global warming was just part of a system of natural heating and cooling of the earth, such as the ice age, explain this.


So long as you are praised think only that you are not yet on your own path but on that of another.

Post Extras: Print Post  Remind Me! Notify Moderator
Criminal DrugAnalyst

Registered: 11/13/04
Posts: 1,690
Re: Global Warming May Have More Current Affects than Previously Thought [Re: Ravus]
    #3633843 - 01/16/05 02:38 AM (11 years, 9 months ago)

Wait, I thought that more sunlight caused cancer, and I thought that MORE sunlight was the fault of us evil civilized beings.


Jackie Treehorn treats objects like women, man

Post Extras: Print Post  Remind Me! Notify Moderator
Stop Bush's war
 User Gallery

Registered: 01/30/03
Posts: 1,457
Loc: Comfy chair in my lounger...
Last seen: 5 years, 4 months
Re: Global Warming May Have More Current Affects than Previously Thought [Re: Ravus]
    #3634155 - 01/16/05 05:36 AM (11 years, 9 months ago)

Interesting. Scarey though :frown:

Computer games don't affect kids. I mean if Pacman affected our generation as kids, we'd all be running around in a darkened room, munching pills and listening to repetitive electronic music.

"Being bitter and hateful is like drinking a vial of poison and hoping the other person gets sick" FreakQLibrium

"My motto from here on out is: If someone or something (including me) in my life is conducting themselves in such a way that they can be seen on Jerry Springer, it's time to take out the garbage!!! When you stop taking their behaviour personally and see their antics as a true reflection on their character, it becomes absolutely nauseating." Anon. on abusive relationships.

Post Extras: Print Post  Remind Me! Notify Moderator
lucid dreamer
 User Gallery

Registered: 01/25/04
Posts: 1,794
Loc: lost at sea
Last seen: 1 year, 10 months
Re: Global Warming May Have More Current Affects than Previously Thought [Re: enotake2]
    #3634395 - 01/16/05 09:40 AM (11 years, 9 months ago)

great post
also sad...

lucidal expansion

Post Extras: Print Post  Remind Me! Notify Moderator
Registered: 03/25/04
Posts: 16
Last seen: 10 years, 12 days
Re: Global Warming May Have More Current Affects than Previously Thought [Re: butterflydawn]
    #3634531 - 01/16/05 11:53 AM (11 years, 9 months ago)

Post Extras: Print Post  Remind Me! Notify Moderator
Jump to top. Pages: 1

Amazon Shop for: Portable Greenhouse

General Interest >> Political Discussion

Similar ThreadsPosterViewsRepliesLast post
* A look at global warming.
( 1 2 3 4 5 6 all )
luvdemshrooms 9,816 119 02/27/04 03:07 AM
by EchoVortex
* Global warming is killing us all! AAAHHHHHHHHHHHHH!!!!!!!
( 1 2 3 4 ... 29 30 )
luvdemshrooms 30,069 589 05/03/08 02:51 PM
by geokills
* OFFICIAL: Global warming mistakes have been made
( 1 2 all )
Visionary Tools 2,060 21 04/11/08 09:21 PM
by supernovasky
* RIP: Man-Made Global Warming Fears 1988-2008
( 1 2 all )
Luddite 3,222 35 07/25/08 05:24 PM
by Phred
* Global warming nothing but pretend communist conspiracy
( 1 2 3 4 5 6 all )
question_for_joo 5,713 112 08/31/04 09:48 PM
by Gijith
* Surprise CO2 rise may speed up global warming
( 1 2 3 4 all )
GazzBut 2,889 67 10/12/04 01:56 PM
by Innvertigo
* Global Warming: The Final Proof?
( 1 2 3 4 5 all )
GazzBut 6,213 91 03/12/05 03:27 PM
by Psychoactive1984
* Katrina Should be A Lesson To US on Global Warming. lonestar2004 797 11 09/01/05 01:38 PM
by snoopaloop53

Extra information
You cannot start new topics / You cannot reply to topics
HTML is disabled / BBCode is enabled
Moderator: Prisoner#1, Enlil
514 topic views. 1 members, 3 guests and 1 web crawlers are browsing this forum.
[ Toggle Favorite | Print Topic | Stats ]
Search this thread:
Shroom Supply
Please support our sponsors.

Copyright 1997-2016 Mind Media. Some rights reserved.

Generated in 0.043 seconds spending 0.004 seconds on 14 queries.