Global WarmingGlobal Warming

Student: Chris EverettStudent: Chris EverettTeacher: Mr. KimballTeacher: Mr. KimballClass: Chemistry B1aClass: Chemistry B1aLab Section: 31192Lab Section: 31192

Greenhouse EffectGreenhouse Effect Our atmosphere acts Our atmosphere acts

as a cover letting as a cover letting light in but not light in but not letting heat escape.letting heat escape.

Earth has an Earth has an average average temperature of temperature of 15°C, this would be -15°C, this would be -18°C without the 18°C without the greenhouse effect. greenhouse effect.

Greenhouse Gases: Greenhouse Gases: MethaneMethane

Methane: CHMethane: CH44– Increases in methane Increases in methane

concentration can be concentration can be due to livestock, paddy due to livestock, paddy rice farming, changes rice farming, changes to swamplands and to swamplands and pipeline loses.pipeline loses.

– A kg of CHA kg of CH44 is said to is said to heat the earth 23 times heat the earth 23 times as much as the same as much as the same amount of COamount of CO22

Greenhouse Gases: Carbon Greenhouse Gases: Carbon DioxideDioxide

Carbon Dioxide:COCarbon Dioxide:CO22– Can be due to Can be due to

burning of fossil burning of fossil fuels and fuels and deforestationdeforestation

– As COAs CO22 emissions emissions rise so do the COrise so do the CO2 2 levels of the levels of the atmosphere and the atmosphere and the temperature also is temperature also is raised.raised.

COCO22 Emissions Emissions

COCO22 Emissions (Contd.) Emissions (Contd.) Does this mean that humans are Does this mean that humans are

causing global warming?causing global warming?As you can see from the previous slide As you can see from the previous slide it seems that rises in carbon dioxide it seems that rises in carbon dioxide are cyclical so the fact that COare cyclical so the fact that CO22 levels levels are elevated right now does not are elevated right now does not directly point to humans in fact there directly point to humans in fact there are naturaly occurring things that emit are naturaly occurring things that emit COCO2 2 into the atmosphere.into the atmosphere.

COCO22 from Volcanoes from Volcanoes Volcanoes releases COVolcanoes releases CO22 SO SO22

HH22O and other chemicals into O and other chemicals into the atmosphere some are the atmosphere some are harmful to the environment harmful to the environment while others are not.while others are not.

There is an estimate that There is an estimate that volcanoes release 3.0 x 10volcanoes release 3.0 x 101212 mol/yr of COmol/yr of CO22

Even though volcanoes do Even though volcanoes do release a lot of COrelease a lot of CO22 it does it does not come close to that of not come close to that of humans. Humans release humans. Humans release almost 150x more COalmost 150x more CO22 a a year than volcanoesyear than volcanoes

Greenhouse Gases: Nitrous Greenhouse Gases: Nitrous OxideOxide

Nitrous Oxide: NNitrous Oxide: N22OO– Can occur from Can occur from

agricultural activity agricultural activity such as fertilizers such as fertilizers and pesticides.and pesticides.

– Per unit of weight Per unit of weight NN22O is estimated to O is estimated to have around 296 have around 296 times the effect on times the effect on the warming of the the warming of the planet as COplanet as CO22