\fIn Earth's natural slate, (II; levels are kept in balance mostly by the activity \"PM! of plant life. no But as humans started burning more and more {IIIreleasing fossil fuels, levels have shifted out of balance. 31" We're emitting too much (I): for the plant: to handle [especially witl'l the no added eecls of deforestation}. Before the Industrial Revolution in the late FEDS, the concentration of (:02 in the Minolphurlu Clrbon Dioxide Iron: Luv Dome In Guru ' atrno-sphere was about 230 parts per in million [pme In the mid-19005, that number was 30G ppm, and at the start 1m 1m 'Hi 1\". in I.\" of the Elst century, we have levels 1\"" {All} around 3150 porn. 13} What is happening to the concenhation of in the atmosphe re? {1 mark} 14} Why is this ha p pe ning? f1 rrmrld \fSome of that released radiation makes it into space, and the rest of it ends up getting reected back down to Earth when it hits cerlain things in the atmospherer such as carbon dioxide, methane gas and water |.Iapour the car windows. The heat that dDE-l'l1t make it out through Earth's atmosphere keeps the ptanet warmer than it is in outer space, because more energy is coming in through the atmosphere than is going out. This is the greenhouse effect that keeps the Earth wan'n. if there were no greenhouse effect on Earth, it would probably look a lot like Mars. Mars doesn't have a thick enough atmosphere to reect much heat hackto the planet, so it gets very cofd there. 1'] 1.I'lul'hat would happen to Earth withoutthe greenhouse effect? {1 mark] So the greenhouse effect is actuaffy a good thing. And as with most good things, modelation is key. The reason we often associate the greenhouse effect with enyironmentai damage is that since the Industrial Reyoiution, the greenhouse effect has fallen out of balance: Ear't's atmosphere is trapping too much heat. 3] If the green house effect is a good thing, why are we worried about it causing environmental damage? [I mrkj \fTrapping Heat when the sun's mys hit the Earth's atmosphere and the surface ofthe Earth, approximately T095 ofthe energy stays on the planet, absorbed by land, oceans, plants and otherthings. The other 30% is reected into space by clouds, snow elds and other reecb'ye surfaces. But even the Eln that gets through doesn't star.r on Ear'I forever [otherwise the Earth would become a blazing reball]. The things around the planet that absorb the sun's heat erlrentuallyI radiate a portion of that heat [radiation] back out at a different wavelength, like your car seals and dash board do. 3] When energy from the Sun hits the Earth's surface - f2 mks] 4] What object: absorb sunlight? IIr'lr'hat objects reect sun light? ['2 rmrks] The process gets its name from the greenhouses that stay nice and warm for growing plants. This is basically the same pro-s that keeps Earth nice and warm for sustaining life. One example of the greenhouse effect that most of us experience in everyday life is the warming of a mr's interior when the vehicle is left out in the sun. 'I'ou'ye probably noticed that 1your car is always much hotter inside than the outside temperature if it's been sitting there for a while. We sun's rays enter through mnuwsrumut your car's windows. Some of the heat from the sun is Farm tHFEIILIi-H m _ cm; mmmm absorbed by the seats, the dashboard and the mrpetlng and floor mats. Iwhen those objects release this heat, it --1.m.11.'nr..-n.u.1-nr doesn't all get out through the windows. Some is \"Elmhlhlir-F reected back in the heat radiated by the seats is a WHHFUP. different wavelength than the light of the sun that made it through the windows in the rst place, and the window glass won't let as much of that wavelength through. So a certain amount of energy is going in, and Ins energy is going out. The result is a gradual increase in the temperature inside your r. Earth's greenhouse effect keeps the planet much warmer than surrounding space. In this article, we'll find out how that happens and see what's involved in maintaining Earth's energy balance. Using the mrin-thesun example, we can look at Earth's atmosphere as a giant, spheriml car window. 2] What are the 11-IHEE steps that lead to the inside of your car being hotter than the outside on a sunny day? ['3 marks] 11 \f