greenhouse effect is it getting warmer?. definition sun’s rays are trapped by greenhouse gases in...
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GREENHOUSE EFFECT
Is it getting warmer?
definition
• Sun’s rays are trapped by greenhouse gases in troposphere
• Heat is trapped like a greenhouse
Is this bad?
• Not all• Need greenhouse
effect to warm earth
• But…• Too much heat
creates global warming (enhanced greenhouse effect)
EARTH
• Without Greenhouse Effect: 32º F
• With Greenhouse Effect: 57 º F
Mars- too little Venus- too much
Enhanced Greenhouse Effect
Human contribution to Greenhouse Gases
GHG
• Greenhouse gas
• Any gas the traps in heat
• Review: What gases make up the atm.?
Greenhouse gases
• Water Vapor– H2O
– Sources (natural)• evaporation• volcanoes
– Concentration• 1-3 ppm
– Lifetime• A few days
– GWP= na
But….Co2 is the biggest man-made
greenhouse gas
Greenhouse gases
• Carbon dioxide-– CO2
– Sources• Burning fossil fuels
• Deforestation (trees use Co2)
• Cement production
– Concentration• 379 ppm (largest man-made contributor)
– Lifetime• varies
– GWP= 1
What do we use fossil fuels for?
• Coal– electricity
• Oil– Gasoline– plastics
• Natural gas– heating
Greenhouse gases
• Methane– CH4
– Sources• Agricultural waste
• Fossil fuels
• Land fills
– Concentration• 1.77 ppm = 1770 ppb
– Lifetime• 12 years
– GWP= 23
Greenhouse gases
• Nitrous Oxide– N20
– Sources• Fertilizers• Combustion of ff
– Concentration• .319 ppm = 319 ppb
– Lifetime• 114 years
– GWP= 296
Greenhouse gas producers
GH gases and climate graph
Are we warming?
Rising sea level by 2080(projected)