How are greenhouse gases suspected of causing climate warming?
1. Solar energy is absorbed by greenhouse gases in the upper atmosphere and re-emitted towards the Earth's surface as heat, causing the climate to warm.
2. Infrared energy from space is absorbed by greenhouse gases in the upper atmosphere, which then re-emit the heat towards the surface of the Earth, causing the climate to warm.
3. Greenhouse gases prevent radiation of infrared energy back into space, trapping the heat near the Earth's surface and causing the climate to warm.
4. Greenhouse gases absorb solar energy and re-emit it into space before it can reach the Earth's surface.
5. Greenhouse gases block solar energy from entering the lower level of the atmosphere.
I really need help with this. Which is the right answer? Please and thank you :)
Question answered by Baccheus
It is 3, aside a from typo in there someplace.
Sunlight does not affect greenhouse gas molecules; it passes right through. The sunlight hits the earth's surface and converts to infrared. That infrared radiation reflects off the surface and into the atmosphere where it eventually escapes back into space. But greenhouse gas molecules vibrate when hit with by infrared, and that vibrating reflects the energy in all directions: up, down and to other molecules. So, the energy takes longer to escape and more of it is retained in the atmosphere.
What is the greenhouse effect, and what effect does it have on the Earth's surface temperature?
What is the greenhouse effect, and what effect does it have on the Earth's surface temperature? What component of Venus’ atmosphere causes the planet to be so hot?
Question answered by poldi
The greenhouse effect was a term coined a few decades ago. A greenhouse is made of material that lets sunlight enter, but doesn't let the heat that accumulates leave. So a greenhouse building can be very hot even in the coldest winter as long as it is in sunlight.
For our planet, when solar radiation reaches the Earth, the atmosphere is transparent to that radiation and it reaches the surface. That heats up the surface.
That heat can be radiated back out to space (as infrared radiation), but some atmospheric gases actually stop that infrared radiation from passing through the atmosphere.
Those gases are mainly carbon dioxide, methane, and to some degree water vapour.
So the greenhouse effect causes the surface temperature of the Earth (the land, the water, and the air) to be warmer than they would be without the effect.
Venus's atmosphere is almost all carbon dioxide (about 96.5%) and that (along with a few other trace gases) has led to what is called a "runaway greenhouse effect".
How much greenhouse gases do humans emit compared to non-human nautural activities?
When did humans begin using greenhouse gases? Also, if humans never created greenhouse gases and today was just an extension of the dark ages, would the global warming trend of the past 100-200 years still be occurring?
Question answered by Eman the Geoman
I am sorry but your question shows that you have a fundamental misconception as to what a "greenhouse" gas is and I surmise that no one has taught you why they are called greenhouse gases(GHG) not how the effect works. Please read this article.
The most volumetric GHG is water vapor, hardly a human invention, Nor is Carbon Dioxide (CO2) a human creation, nor methane gas, nor ozone. Humans and farm animals produce these in the course of living and are increased by industrial activities.
Were it not for the "greenhouse effect" life as we know it could not exist on earth. CO2 is a necessary chemical for plants to make oxygen and Ozone filters out harmful ultraviolet rays. Water Vapor---well without it there would be no rains.
I assume you are referring to the "Little Ice Age" (not the "dark ages" ) of the 1500s. For a better discussion of these warming cooling cycles please look at this link:
And you might want to take the global warming/climate change test here:
How much greenhouse gases are produced in the cooking of a single souvlaki?
Just wondering how many greenhouse gases are produce in the cooking of the average souvlaki. I am looking for the types and quantities of the gases.
Question answered by tinkertailorcandlestickmaker
Well, if you count just the cooking and not production of the food, then, if you grill it over wood charcoal, the net CO2 is zero since the tree the wood came from, got the carbon from the atmosphere to start with. CO2 and CO and water vapor are the main products of burning charcoal. Some methane or similar hydrocarbons might be produced during the production of the charcoal but it might not be significant depending on the process used . If the wood/charcoal, was transported using fossil fuels then there would be some net greenhouse gas production, but without knowing details it would be hard to guess how much. In any case the production of the raw food by modern agricultural methods will produce more greenhouse gases than the cooking. If you were to put [ greenhouse gases hamburger ] into your favorite search engine you'd get a lot of information about a perhaps similarly sized piece of food.
Whats the difference between greenhouse effect and global warming?
And dont we need the greenhouse efffect otherwise we would freeze to death. And what are the gases that trap the heat and can you please tell me about the ozone layer. Please explain in quite a bit of detail because i want to know what people i doing about it but im not really filled in with the actual facts. Thanks, it will also help me in exams to :)
Question answered by Bob
The difference between greenhouse effect and global warming is the greenhouse effect is a demonstrable fact and global warming is a fantasy loosely derived from the greenhouse effect.
Greenhouse effect says that the nature and content of air tends to hold heat near the earth.
The idea that a gas that makes up 0.036% of air (carbon dioxide) causes the warming effect, which is physically impossible, is called global warming.
How could increased levels of greenhouse gases cause anything other than global warming?
1) First off, does anyone dispute that humans are producing greenhouse gases?
2) If this is accepted, then is there any dispute that they're going anywhere other than into the atmosphere and / or atmospheric concentrations of GHG's are increasing?
3) If it's agreed that we are adding GHG's to the atmosphere, then is it also agreed that they are contributing to global warming?
4) If not, then what's the difference between manmade GHG's and the natural ones that ensure this planet has a habitable temp?
Question answered by Dana1981
I'm going to anticipate the answers being that yes greenhouse gases cause global warming, but we don't know how much, and CO2 is a trace gas so it's a negligible effect.
Let's see if I guessed right...
What are the percentages of greenhouse gases?
Well, out of all the greenhouse gases, what are the percentages of each? All that I know is that water vapor makes up most of it, and CO2 makes up the next largest.... Also, it would be great if you could tell me how strong each greenhouse gases are, concerning the greenhouse effect, thank you or your help!
Question answered by cyswxman
Water vapor is the big greenhouse gas in our atmosphere. While composing less than 1% of the atmosphere, it is responsible for about 95% of the greenhouse effect. CO2 is the next most abundant greenhouse gas, contributing about 3% of the effect. See more information here: http://lwf.ncdc.noaa.gov/oa/climate/gases.html
How do i attract bees into my greenhouse to pollinate my vegetables?
I rent a large greenhouse and want to attract insects to pollinate my plants, but am worried that they won't get in because of the relatively small entrance.
What attracts them?
Is it the smell, or the flowers?
Any advice would be appreciated.
Question answered by toocool
Put flowering plants outside and just inside the entrance to your greenhouse. Bees will discover the plants outside, explore, and go inside. One or two is all it takes and they invite the rest of their hive. Bees are attracted to bright colors, but they won't come back unless they find a source of nectar.
What do I use to restore the finish on an old fiberglass greenhouse?
The greenhouse is a Solar Prism Greenhouse. It is aprox. 15 yrs old and the fiberglass is sluffing off.
Question answered by 1rhino
Try using fiberglass automotive repair kit. If it works on a car it should work on a greenhouse.
How do greenhouse gases work, quantum mechanically speaking? How do they block infrared radiation?
So how do greenhouse gases work? They allow visible light from the sun to pass through the atmosphere, but block infrared radiation (heat) from leaving it. I know greenhouse gases are some of the bigger molecules, so I think that has something to do with it. Basically, what makes carbon dioxide a greenhouse gas and nitrogen not a greenhouse gas?
Also, anybody know the specific wavelength ranges that greenhouse gases (particularly carbon dioxide) block and those that it allows to pass through?
tl;dr: how do greenhouse gases work
or, even more succinctly: why are greenhouse gases greenhouse gases?
Question answered by Biofreak
The idea is simple. Every molecule is made up of atoms and these atoms can vibrate within that molecule (think of them like balls on springs). If they can vibrate at a frequency that corresponds to an infrared photon frequency, then that molecule will absorb that photon and re-emit it in a random direction. So that photon will end up bouncing around in the atmosphere more that it would have if it were not absorbed and passed straight through the atmosphere.
Now you might wonder why some molecules absorb in the infrared and some do not. Well, everything absorbs at some wavelength. The frequency something absorbs at depends on how tightly bound the parts of the 'something' are. Atoms typically absorb in the visible or ultraviolet frequencies because the electrons on the atoms are very tightly bound so they vibrate at very high frequencies. Molecules are less tightly bound, so they absorb in the visible and infrared. To absorb in the 'green house' band, then they simply need to be bound with the right 'tightness'.
Actually, the mass of the molecule is not the critical issue. Greenhouse gasses are not heavier than other gasses. It simply that they have some frequency at which they vibrate that happens to be in the infrared (and most molecules have tens of different frequencies at which they vibrate). CO2 is an example of a greenhouse gas, but methane (CH4) is a much more 'efficient' greenhouse gas and weighs quite a bit less than N2. In fact, water is one of the worst greenhouse gasses (H2O). How good a gas is at being a greenhouse gas simply depends on what frequencies it vibrates at, which depends on how massive the atoms in the molecule are and how strong the bond is.