5 Views · 1 month ago

This video is about The Greenhouse Effect

7 Views · 1 month ago

Great demonstration of how the greenhouse effect is warming up the earth.

From the Peter Wothers lecture - It's a Gas

11 Views · 1 month ago

Greenhouse Effect and Global Warming

Greenhouse effect
 As the sun’s rays enter our atmosphere, the Earth’s surface absorbs light energy from the sun and emits it as heat energy.
 About 31 % of the incoming radiation from the sun is reflected directly back to space by the earth's atmosphere.
 Another 20 % is absorbed by the atmosphere. The rest of the incoming radiation is absorbed by the earth's oceans and land, where it is converted into heat, warming the surface of the earth and the air above it.
 However, several gases in Earth’s atmosphere — such as carbon dioxide, methane and water vapor work like a blanket over the earth’s surface to retain much of this heat from escaping to outer space. That helps to warm our earth’s atmosphere. The gases do this by absorbing the heat and radiating it back to Earth’s surface. Such gases are called “greenhouse gases” because of their heat-trapping effect.
 The phenomenon wherein the earth’s atmosphere trap the heat from the sun and retain it from escaping into outer space and increasing the earth’s surface temperature is called “Greenhouse effect”. Without this greenhouse effect, Earth would be too cold to support most forms of life.

Global Warming
 Global Warming is the increase of Earth's average surface temperature due to effect of greenhouse gases, such as carbon dioxide, methane , nitrous oxide and water vapor which trap radiated heat that would otherwise escape from Earth into the outer space.

Concept of Greenhouse

You might have seen in botanical garden plant growers growing plant in green houses.
Lets us try to understand the concept of growing plants in green houses.

 The most basic greenhouse would be a simple transparent structure, preferably made up of glass or transparent plastic.
 When the radiations of sunlight enter through the transparent walls of the greenhouse, it heats up the floor of the greenhouse.
 The floor releases some of this thermal energy, which heats the layer of air at the bottom of the greenhouse.
 Warmer air is lighter than cooler air, so the heated air rises to the top of the greenhouse. When the heated air rises, cooler air replaces it at the bottom of the greenhouse. This air becomes heated by the floor and also begins to rise.
 This circulation of air helps keep greenhouse warmer than outside atmosphere.
 Hence, greenhouses are useful for growing plants in cold climatic condition.

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4 Views · 1 month ago

Let's understand what is the Greenhouse effect and how it affects us?

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6 Views · 1 month ago

A description of the greenhouse effect and greenhouse gases. IB DP Biology Standard Level. Topic 4.4.

1 Views · 1 month ago

The greenhouse effect might be misnamed. #Greenhouse #climate #climeworksTeamEarth #climatechange #climeworks. Join our team in the fight against climate change. Remove carbon dioxide today at https://actnow.climeworks.com/MinuteEarth

9 Views · 1 month ago

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Mercy shows what the greenhouse effect is and how it works by using a simple experiment that you can try out at home.

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1 Views · 1 month ago

Learn the basics about the natural greenhouse effect.

The atmosphere helps to keep our planet warm by making it harder for the energy we get from the sun to escape back to the universe. Our atmosphere is held to the earth by the force of gravity.

Visible light gets straight through our transparent atmosphere and is partly absorbed by the earth which gets hot. Hot things radiate infra red rays. Although visible light got through the atmosphere, the infra red radiation coming from the earth finds it more difficult to get through. So the atmosphere acts a bit like glass letting visible light through to warm the earth but some of the heat (or infra-red) radiation now given off gets absorbed by certain gases in the atmosphere, called greenhouse gases.

In this way the earth is kept warm and we say there is a natural greenhouse effect. The two natural gases that absorb infra-red are water vapour and carbon dioxide. Clouds, made of water droplets, insulate night skies in the winter, but without the clouds the heat gets away and frost forms.

Before the world became industrialised by burning fossil fuels such as coal oil and natural gas, the carbon dioxide concentration in the atmosphere was about 0.028% tiny compared with O=O at 21% and NN at 78%, but enough to keep us warm. Without this natural blanket of insulating gas the earth would be too cold to support life as we know it.

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2 Views · 1 month ago

PhET Simulation: http://phet.colorado.edu/en/simulation/greenhouse

In this video Paul Andersen explains how the greenhouse effect and greenhouse gases keep our planet warm enough to be habitable. He explains how greenhouse gases keep heat closer to the surface. He finally shows how increases in greenhouse gases may lead to dangerous global warming.

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All of the images are licensed under creative commons and public domain licensing:
balin, jean victor. Cartoon Cloud, December 2, 2009. [1]. http://commons.wikimedia.org/w....iki/File:Cartoon_clo
Dbc334. English: Molecule of Methane., October 24, 2006. Own work. http://commons.wikimedia.org/w....iki/File:Methane-3D-
Duke, Eli. Tour of the Drilling Facility, December 1, 2012. Flickr: Antarctica: WAIS Divide Field Camp. http://commons.wikimedia.org/w....iki/File:Antarctica_
Edgar181. 3D Representation of Carbon Dioxide Created with ChemDraw., [object HTMLTableCellElement]. Edgar181. http://commons.wikimedia.org/w....iki/File:Carbon_diox
File:GISP2 1855m Ice Core Layers.png, n.d. http://commons.wikimedia.org/w....iki/File:GISP2_1855m
"File:Top of Atmosphere.jpg." Wikipedia, the Free Encyclopedia, April 15, 2014. http://en.wikipedia.org/w/index.php?title=File:Top_of_Atmosphere.jpg&oldid=363610726.
"File:Trichlorofluoromethane-3D-vdW.png." Wikipedia, the Free Encyclopedia. Accessed April 17, 2014. http://en.wikipedia.org/wiki/F....ile:Trichlorofluorom
Ito, Joi. English: "Ichigogari": Strawberry Greenhouse, February 16, 2008. originally posted to Flickr as Strawberry greenhouse. http://commons.wikimedia.org/w....iki/File:Strawberry_
mehmetaergun. Africa-Centered, "Upside-down" Earth, May 1, 2007. Own work. http://commons.wikimedia.org/wiki/File:Earth.svg.
Mills, Ben. Space-Filling Model of Nitrous Oxide, N2O, July 30, 2007. Own work. http://commons.wikimedia.org/w....iki/File:Nitrous-oxi
———. Space-Filling Model of the Ozone Molecule, O3., May 27, 2009. Own work. http://commons.wikimedia.org/w....iki/File:Ozone-CRC-M
"The Greenhouse Effect." PhET. Accessed April 17, 2014. http://phet.colorado.edu/en/simulation/greenhouse.
work, Own. English: Structure of the Water Molecule (H2O), August 2008. Based in part on the public domain image Image:H2O (water molecule).jpg by Solkoll. Corrected by Plenz. http://commons.wikimedia.org/w....iki/File:Water_molec
———. English: Structure of the Water Molecule (H2O), August 2008. Based in part on the public domain image Image:H2O (water molecule).jpg by Solkoll. Corrected by Plenz. http://commons.wikimedia.org/w....iki/File:Water_molec

1 Views · 1 month ago

#brainpop #greenhousegases #environment

Is it hot in here, or is it just us? Nope, it’s definitely hot in here! In this BrainPOP movie, Tim and Moby shine some light on the topic of the greenhouse effect. First, you’ll discover what the greenhouse effect is, including how gases in Earth’s atmosphere act like a giant greenhouse to create the effect on a global scale. You’ll also learn why the greenhouse effect is important to keep us alive on Earth! Plus, you’ll see how the greenhouse effect relates to global warming, and what we can do to prevent a global meltdown! Can somebody open a window?

2 Views · 1 month ago

Let's learn all about greenhouse effect today.

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2 Views · 1 month ago

A quick look at the greenhouse effect, how it works, and how it relates to the issue of climate change. Additional science videos and resources at: https://science.glide.page
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2 Views · 1 month ago

Educational video for children to learn what the Greenhouse Effect is and how it works. The Earth is surrounded by the atmosphere, a thin gaseous layer which allows part of the solar radiation to penetrate. To do that, this layer contains gases called "greenhouse effect gases", whose mission is to absorb part of that, and maintain the temperature of the planet. One of the main greenhouse effect gases is CO2, also known as carbon dioxide. In this video, children will find out that the increase of these gases is harmful for the Earth and they will look at several examples related to the cause of this increase like the Industrial Revolution, traffic, electricity consumption, factory production, massive farming or wildfires. At the end of the video, children will be able to explore ways to prevent this situation from getting worse like recycling, using renewable energies, electric transportation or reducing the use of plastic containers.

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2 Views · 1 month ago

Hello Friends!
Check out our video on "Greenhouse Effect and Global Warming” by Letstute.

Greenhouse Effect and Global Warming
Environmental Science

0:00 Introduction
2:40 What is the Green House Effect?
4:24 What is Global Warming?
5:12 How We Can Prevent or Stop Global Warming.

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1 Views · 1 month ago

The science behind our lovely, relatively constant temperature on Earth (at least compared to the Moon!)
Part of our unit on Earth Systems. Check it out here:

1 Views · 1 month ago

The greenhouse effect can be thought of a little bit like the blanket you cover yourself with at night to keep warm. Our planet has an atmosphere around it containing certain gases that trap heat energy helping to keep the planet warm. And, no matter what anyone tells you, the greenhouse effect is a very good thing. No scientist would ever challenge that statement. The greenhouse effect is an entirely natural process. It was taking place long before the first lump of coal was ever burnt or the first cow let one rip.

But what exactly is it and how does it work?

The explanation starts with energy waves, presented here on the electromagnetic spectrum. Radio waves, light, x-rays… they’re all basically the same thing. We often think of them as travelling in waves and the thing that makes them different from each other is the length of that wave. To understand the greenhouse effect we’re interested in infrared waves, a fancy term for heat waves, as well as visible light. Notice that infrared waves have a longer wavelength than light waves. That’s an important detail.

As you probably know, we get our energy from the Sun. The energy from the Sun reaching our planet is mostly in the form of light energy. We’ll call this shortwave radiation to keep things simple.

Some of that energy is absorbed by the planet’s surface, causing an increase in temperature. Energy that has been absorbed and warmed an object can be then be released, but it isn’t released as light energy. The energy is released, or re-emitted, to use the correct term, as infrared waves (heat, in other words). Remember that these heat waves have a longer wavelength than the light waves that first reached the surface. From here on in we’ll call these infrared waves long wave radiation.

Next, let’s look space. Space is cold. Its baseline temperature is about -270 degrees Celsius. Very cold indeed. Far too cold for life to exist. Fortunately, since our planet orbits close to the Sun (close in astronomical terms, that is) we are kept well above that temperature.

However, if the Earth were to absorb and re-emit energy the way I’ve already described, and all of that long wave radiation is allowed to leave the Earth system, the average temperature of the surface would be around -18 degrees Celcius. That’s better than the -270 of space, but still fairly cold. We know the Earth isn’t really that cold… so what are we missing? Enter the greenhouse effect.

Fortunately for us, specific gases in our atmosphere, gases such as carbon dioxide, methane and others, all known as greenhouse gases, are able to absorb and re-emit the long wave radiation coming from the surface of the Earth. Now remember, shortwave radiation reaches us from the Sun, but long wave radiation is radiated from the surface. These greenhouse gases are not able absorb short wave radiation reaching the Earth. Consequently, they let the Sun’s energy in, but then trap some of it as it tries to leave. This trapping of heat energy obviously raises the temperature in the atmosphere, Earth’s surface and it’s oceans.

So basically, our atmosphere traps some of the heat energy in the Earth system, keeping it that bit more warm. As a result of Earth’s natural greenhouse effect the average temperature on our planet is about 15 degrees Celsius, 33 degrees warmer than it would be without any greenhouse effect.

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1 Views · 1 month ago

Keep going! Check out the next lesson and practice what you’re learning:https://www.khanacademy.org/sc....ience/ap-college-env

The principal greenhouse gas is carbon dioxide. Greenhouse gases capture electromagnetic radiation and cause warming. Increased greenhouse gas concentration is contributing to global warming on Earth.

Khan Academy is a nonprofit organization with the mission of providing a free, world-class education for anyone, anywhere. We offer quizzes, questions, instructional videos, and articles on a range of academic subjects, including math, biology, chemistry, physics, history, economics, finance, grammar, preschool learning, and more. We provide teachers with tools and data so they can help their students develop the skills, habits, and mindsets for success in school and beyond. Khan Academy has been translated into dozens of languages, and 15 million people around the globe learn on Khan Academy every month. As a 501(c)(3) nonprofit organization, we would love your help!

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0 Views · 1 month ago

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0 Views · 1 month ago

From droughts to monsoons and extreme weather patterns, climate change may be easy to see and feel, but the issues surrounding it are often far more complex. Global Ideas has come up with a series of films and infographics to answer some of the most pressing problems and explain certain climate concepts and solutions. This time we take a look at what the greenhouse effect is and how it leads to increasing temperatures. We look forward to a lively discussion with you.

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0 Views · 1 month ago

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Correction to what I say at 7 mins 13: The major reason air pressure decreases is that the gravitational pressure from the air above it decreases. The gravitational force itself also decreases but that's a rather minor contribution. Sorry about that, a rather stupid brain-fart.

How does the greenhouse effect work? Greenhouse gases, such as carbon dioxide and methane, prevent infrared radiation from escaping to outer space. This warms the surface of earth. More greenhouse gas means more warming. Simple enough! Alas, if you look at the numbers, it turns out that most infrared radiation is absorbed almost immediately above the ground already at pre-industrial greenhouse gas levels. So how does it really work? In this video, I try to sort it out.

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00:00 Intro
00:40 The Greenhouse Effect: Middle School Version
03:17 The Greenhouse Effect: High School Version
10:33 The Greenhouse Effect: PhD Version
14:30 Stratospheric Cooling
16:24 Summary
18:14 Protect Your Privacy With NordVPN

#science #climate

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