Transcript Global Warming - Cloudfront.net

Hundreds Gather to Protest…
Global Warming!
Mr. Jocz’s
–International
Panel on Climate
Change (UN):
Human pollutants
causing global
climate change
Nobel
Prize, 2007
How Warming Occurs
• Sun waves hit
Earth surface 
either
reflect/absorbed.
• Incoming UV,
outgoing Infrared
• GGases trap
reflected IR light
waves 
warming
GW: Natural process  warmer
Earth
Greenhouse Gases
Significant
Seven!!
• All trap solar radiation in atmosphere
• CO2
• Water Vapor
• CH4
• CFC’s
• N2O (nitrous oxide)
• SOx
• Trop. O3
Water Vapor
• MAJOR greenhouse gas (85-97% of
natural warming)
• Humans don’t affect its concentrations
Cloud Cover
• Cover 60% of Earth; reflect 30% of
light
• White Ice  High Albedo (high
reflectivity)
Increase in CO2
• Cycling due to seasons
• Peaks CO2: fall  spring: RESP!
• Troughs CO2: spring  fall: PS!
0.5° C increase
over 100 yrs
Pre I: 280 ppm
Post I: 360 ppm
Methane CH4 Emissions
• Traps 25 x’s more heat than CO2
• Emissions: Anaerobic breakdown of org.
material by bacteria in swamps, rice
paddies, landfills, intestinal tracts,
• Also, nat. gas leaks
Methane Reduction?
• Scientists are trying to invent new feeds
for cows to reduce the amount of
greenhouse gases they produce.
• http://news.bbc.co.uk/player/nol/newsid_6280000/newsid_6289
500/6289542.stm?bw=nb&mp=wm&news=1&ms3=6&ms_javas
cript=true&bbcws=2
CFCs
• Can absorb 1500-7000 times more radiation
than 1 mol. of CO2
• Very stable (65-135 yrs)
• Phased out by Montreal Protocol
Nitrogen Oxides
• Emissions:Burning
of gas, fertilizer app,
feces.
• Lifespan: 120 yrs
• Traps 230 times as
much as CO2
Sulfur Oxides
Mt. Pinatubo
• Emissions: Volcanoes, Coal
burning, Smelting
• 15 x’s stronger than CO2
Kyoto Protocol
• Int. env. treaty
12/11/97,
Effective in 2005
• Industrialized
countries met in
Japan to agree
to reduce
greenhouse gas
emissions.
#YOLO!
No More
Kyoto for
Us!