+- Forums (https://eu-forums.com)
+-- Forum: EU Forums (https://eu-forums.com/forum-19.html)
+--- Forum: Environment Forum (https://eu-forums.com/forum-6.html)
+--- Thread: How does global warming actually work? (/thread-5633.html)
How does global warming actually work? - JackSHansen - 01-27-2011
As debates about whether or not global warming is actually happening I figure this is the best time to actually figure what global warming is and hopefully get some of my questions answered. I already know by the term alone that global warming is the earth warming. I guess my main question is about the CO2 gas. Does the CO2 gas trap the heat so it can't escape the earth's atmosphere and that is how the earth is warming? If this is happening wouldn't the CO2 make it so the sun's heat doesn't get past the atmosphere in the first place making the earth not heat?
Re: How does global warming actually work? - DonnaDErickson - 01-27-2011
Well global warming as we know it,is the co2 gases from cars,nuclear plants,etc. rise to the atmosphere and cannot escape the ozone layer. Therefor it "rubs" against the co2 and causes the ozone to become weak over time,hence a hole in the ozone layer. I hate global warming myself,the mear thought that we could have a global disaster is scary,I hope people realize what they are doing to the Earth,cause there would be no cars,or nuclear plants,etc.,if it wasn't for the Earth,hope I helped.
Re: How does global warming actually work? - Loyal - 01-27-2011
Most of the Sun's energy comes to Earth in the form of visible light, what climatologists call shortwave radiation. That warms the Earth, and in order to be in equilibrium, Earth must emit as much energy as it receives.
But the Earth is a whole lot cooler than the Sun, so when Earth emits radiation, it emits in the infrared part of the spectrum, what climatologists call longwave radiation.
CO2 and other greenhouse gases are transparent to visible light, but absorb in the infrared. So they let the sunlight in, but don't let Earth's balancing radiation back out again. When they absorb infrared, they heat up. That keeps the lower atmosphere warm, which warms the surface.
Re: How does global warming actually work? - AshleyWLevitt - 01-27-2011
What Is Global Warming?
The Planet Is Heating Up—and Fast
Glaciers are melting, sea levels are rising, cloud forests are drying, and wildlife is scrambling to keep pace. It's becoming clear that humans have caused most of the past century's warming by releasing heat-trapping gases as we power our modern lives. Called greenhouse gases, their levels are higher now than in the last 650,000 years.
Photograph by Paul Nicklen
We call the result global warming, but it is causing a set of changes to the Earth's climate, or long-term weather patterns, that varies from place to place. As the Earth spins each day, the new heat swirls with it, picking up moisture over the oceans, rising here, settling there. It's changing the rhythms of climate that all living things have come to rely upon.
What will we do to slow this warming? How will we cope with the changes we've already set into motion? While we struggle to figure it all out, the face of the Earth as we know it—coasts, forests, farms and snow-capped mountains—hangs in the balance.
Greenhouse effect
The "greenhouse effect" is the warming that happens when certain gases in Earth's atmosphere trap heat. These gases let in light but keep heat from escaping, like the glass walls of a greenhouse.
First, sunlight shines onto the Earth's surface, where it is absorbed and then radiates back into the atmosphere as heat. In the atmosphere, “greenhouse” gases trap some of this heat, and the rest escapes into space. The more greenhouse gases are in the atmosphere, the more heat gets trapped.
Scientists have known about the greenhouse effect since 1824, when Joseph Fourier calculated that the Earth would be much colder if it had no atmosphere. This greenhouse effect is what keeps the Earth's climate livable. Without it, the Earth's surface would be an average of about 60 degrees Fahrenheit cooler. In 1895, the Swedish chemist Svante Arrhenius discovered that humans could enhance the greenhouse effect by making carbon dioxide, a greenhouse gas. He kicked off 100 years of climate research that has given us a sophisticated understanding of global warming.
Levels of greenhouse gases (GHGs) have gone up and down over the Earth's history, but they have been fairly constant for the past few thousand years. Global average temperatures have stayed fairly constant over that time as well, until recently. Through the burning of fossil fuels and other GHG emissions, humans are enhancing the greenhouse effect and warming Earth.
Scientists often use the term "climate change" instead of global warming. This is because as the Earth's average temperature climbs, winds and ocean currents move heat around the globe in ways that can cool some areas, warm others, and change the amount of rain and snow falling. As a result, the climate changes differently in different areas.
Aren't temperature changes natural?
The average global temperature and concentrations of carbon dioxide (one of the major greenhouse gases) have fluctuated on a cycle of hundreds of thousands of years as the Earth's position relative to the sun has varied. As a result, ice ages have come and gone.
However, for thousands of years now, emissions of GHGs to the atmosphere have been balanced out by GHGs that are naturally absorbed. As a result, GHG concentrations and temperature have been fairly stable. This stability has allowed human civilization to develop within a consistent climate.
Occasionally, other factors briefly influence global temperatures. Volcanic eruptions, for example, emit particles that temporarily cool the Earth's surface. But these have no lasting effect beyond a few years. Other cycles, such as El Niño, also work on fairly short and predictable cycles.
Now, humans have increased the amount of carbon dioxide in the atmosphere by more than a third since the industrial revolution. Changes this large have historically taken thousands of years, but are now happening over the course of decades.
Why is this a concern?
The rapid rise in greenhouse gases is a problem because it is changing the climate faster than some living things may be able to adapt. Also, a new and more unpredictable climate poses unique challenges to all life.
Historically, Earth's climate has regularly shifted back and forth between temperatures like those we see today and temperatures cold enough that large sheets of ice covered much of North America and Europe. The difference between average global temperatures today and during those ice ages is only about 5 degrees Celsius (9 degrees Fahrenheit), and these swings happen slowly, over hundreds of thousands of years.
Now, with concentrations of greenhouse gases rising, Earth's remaining ice sheets (such as Greenland and Antarctica) are starting to melt too. The extra water could potentially raise sea levels significantly.
As the mercury rises, the climate can change in unexpected ways. In addition to sea levels rising, wea
Re: How does global warming actually work? - LarryIBynum - 01-27-2011
Methane, leading controller to global temps second only to the sun, is released into the atmosphere after being trapped in the ocean floor sediment. The rise and fall in temps either stores or releases the methane. A release warms , trapping it with warm water cools the earth.
But this is not what the media is freaking out about. They are crying about co2.
First off, co2 levels would need to be 100x what they are to change the temps the way the media has publicized the actual change from co2 alone.
Second; Acording to science, not media hysteria, the entire solar system is experiencing warming from the sun. Proof? Hey! guess what? ;
<!-- m --><a class="postlink" href="http://www.abovetopsecret.com/forum/thread221608/pg1">http://www.abovetopsecret.com/forum/thread221608/pg1</a><!-- m -->
3rd; Solar cycles once let ice connect Asia with N.America just a few thousand years ago. Man did not melt that ice, so the liberal liars who don't base their work on real science can...welll...take a hike.