Knowledge+Saturation

media type="custom" key="4210223"

=__//Class work / Homework//__=

//In class at moment we have been learning about greenhouse gases and what causes them the table below will show you what we have learnt.// cars instead of normal cars.// || the industry is if we have less factorys.// || that none should be allowed to light forest fires delebritly. Its fine if its natural though.// ||
 * ==//What causes greenhouse gasses//== || ==//What what can prevent this//== ||
 * =====//Cars and pollution//===== || //People using battery operated
 * //Cows farting out methane// || //We can't// ||
 * //Industry// || //The only way we can cut down on
 * //Forest Fires// || //The only way we can stop this is

=__//Greenhouse Gases found on www.wikipedia.com//__=

//Greenhouse gases are gases in an atmosphere that absorb and emit radiation within the thermal infrared range. This process is the fundamental cause of the greenhouse effect. The main greenhouse gases in the Earth's atmosphere are water vapor, carbon dioxide, methane, nitrous oxide, and ozone. In our solar system, the atmospheres of Venus, Mars and Titan also contain gases that cause greenhouse effects. Greenhouse gases greatly affect the temperature of the Earth; without them, Earth's surface would be on average about 33°C (59°F) colder than at present.

Human activities since the start of the industrial era around 1750 have increased the levels of greenhouse gases in the atmosphere. The 2007 assessment report compiled by the IPCC observed that "changes in atmospheric concentrations of greenhouse gases and aerosols, land cover and solar radiation alter the energy balance of the climate system", and concluded that "increases in anthropogenic greenhouse gas concentrations is very likely to have caused most of the increases in global average temperatures since the mid-20th century".

Simple diagram of greenhouse effect I read this and i think its pretty complicated but I agree that is the process of greenhouse gases.

media type="youtube" key="GAi8Lxf8JXA" height="344" width="425"

Watch this video people trust me its a real eye opener it shows how we create greenhouse gases and a little bit on how to prevent from creating them.//

=__//Discover the scientific facts on greenhouse effect//__= __//**What is the greenhouse effect?**//__ //The greenhouse effect is a natural warming process of the earth. When the sun's energy reaches the earth some of it is reflected back to space and the rest is absorbed. The absorbed energy warms the earth's surface which then emits heat energy back toward space as longwave radiation. This outgoing longwave radiation is partially trapped by greenhouse gases such as carbon dioxide, methane and water vapour which then radiate the energy in all directions, warming the earth's surface and atmosphere. This is the greenhouse effect. [|__//More...//__]//
 * //[|__The greenhouse effect and global warming__]//
 * //[|__The climate change and greenhouse effect__]//
 * //[|__read the GreenFacts Digest on global climate change and greenhouse effect__]//

Of the incoming solar radiation, 49% (168 Wm-2) is absorbed by the surface. That heat is returned to the atmosphere as sensible heat, as evapotranspiration (latent heat) and as thermal infrared radiation. Most of this radiation is absorbed by the atmosphere, which in turn emits radiation both up and down. The radiation lost to space comes from cloud tops and atmospheric regions much colder than the surface. This causes a greenhouse effect. //Increasing the amount of greenhouse gases intensifies the greenhouse effect. Higher concentrations of CO2 and other greenhouse gases trap more infrared energy in the atmosphere than occurs naturally. The additional heat further warms the atmosphere and Earth’s surface.// //Climate models suggest this natural warming is being enhanced by human activities that increase concentrations of greenhouse gases in the atmosphere and greenhouse effect. The increase in atmospheric concentration of greenhouse gases, accentuating the natural greenhouse effect globally, is also called the enhanced greenhouse effect or Global Warming.//

=//__**Are greenhouse gases like a blanket around the Earth? **__//=  //No, for the same reason that they don't behave like an actual greenhouse, they simply do not behave as a barrier to convective activity and so aren't "like a blanket." //

//Forgetting about the unfortunate-but-commonly-used terminology for a moment, is the so-called 'greenhouse effect' bad? //
 //No, it's necessary to maintain a habitable planet. Our moon, lacking greenhouse effect, makes a kind of comparison even though lack of atmosphere makes it uninhabitable regardless of temperature. The moon's mean surface temperature by day is 107 °C (380 K, 225 °F) and by night drops to -153 °C (120 K, -243 °F). The Lunar surface temperature increases about 260 °C from just before dawn to Lunar noon. // =//__How much does the so-called 'greenhouse effect' warm the Earth? __//=  //It's estimated that the Earth's surface would be about -18 °C (0 °F, 255 K) with atmosphere and clouds but without the greenhouse effect and that the (we'll call it "natural") greenhouse effect raises the Earth's temperature by ~33 °C (59 °F). // //We should note that devoid of atmosphere Earth would actually be a less-cold -1 °C (272 K) because the first calculation strangely includes 31% reflection of solar radiation by clouds (which obviously could not occur without an atmosphere) while ignoring that clouds add significantly to the greenhouse effect. Granted it's kind of a bizarre to include clouds in one half the calculation and not the other but that is the way it's commonly done, so, for simplicity, just stick with ~33 °C. //