Earth and Space Grade 10 ST 2011.  dc_M&feature=related.

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Presentation transcript:

Earth and Space Grade 10 ST 2011

 dc_M&feature=related

 Sunlight heats the Earth  The warm Earth radiates energy (in the form of infrared radiation, or heat) back out  Some of this infrared radiation is trapped in the atmosphere, giving Earth its temperate climate  THIS= Greenhouse effect

 Without it, our climate would be harsh and severe like on the moon  The greenhouse effect is very similar to a car on warm summer’s day, the heat gets trapped inside the car making it scorching HOT!!

Carbon Dioxide (CO 2 ) Source: Fossil fuel burning(cars, factories), deforestation Average atmospheric residence time: 500 years Carbon Dioxide is not dangerous itself, but too much of it has a profound effect Methane (CH 4 ) Source: Rice cultivation, cattle & sheep ranching, decay from landfills, mining Average atmospheric residence time: 7-10 years Nitrous oxide (N 2 O) Source: Industry and agriculture (fertilizers) Average atmospheric residence time: years Water Vapor (H 2 O) Source: Rain and Oceans

Is global warming real? a) Yes b) No How much has the average temperature of the Earth risen in the last 100 years? a) ~ 0.5°C b) ~ 1.0°C c) ~ 5.0°C d) ~ 10.0°C This is the highest temperature ever recorded in Earth’s history. a) Yes. b) No. Who is to blame? a)Human activities b)Nature causes c)ET d)NoCanTell! What is to blame? a)Ozone b)CO 2 c)H 2 O d)O 2

Is global warming real? a) Yes b) No How much has the average temperature of the Earth risen in the last 100 years? a) ~ 0.5°C b) ~ 1.0°C c) ~ 5.0°C d) ~ 10.0°C As far as we know, this is the highest temperature ever recorded in Earth’s history. a) Yes. b) No. Who is to blame? a)Human activities b)Nature causes c)ET d)NoCanTell! What is to blame? a)Ozone b)CO 2 c)H 2 O d)O 2 e)NoCanTell. It is real complicated!

 The greenhouse effect & global warming are not the same thing.  Global warming refers to a rise in the temperature of the surface of the earth  An increase in the concentration of greenhouse gases leads to an increase in the magnitude of the greenhouse effect. (Intensification)  This results in global warming

 The balance of CO 2 we are used to experiencing, has unbalanced over the last years  CO 2 mainly came from forest fires, volcanic activity, and cellular respiration  The oceans and plants(photosynthesis) were able to absorb the level of emmissions = stable temperatures! NO MORE….

 Population Growth is the main cause for the extra CO 2 we are experiencing in our environment.  More cars  More energy use in homes  Bigger factories

 Global warming!  Rise in tides  Heavy drought  Spread of disease  Climate Change  Endangered species  Think Arctic warming

 Excessive methane causes a greenhouse effect 21 times greater than CO 2  Sources: farm animal digestion, manure storage, rice farming, decomposing household waste  Excessive Nitrous Oxide also emphasizes the greenhouse effect  Primary Source: Fertilizers

If we were to move the Earth closer to the Sun, like where Venus is now, then we would suffer the runaway greenhouse effect as well, lose all the water, and become hot like Venus.

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