fossil fuels 85% of the world’s commercial energy coal oilnatural gas
Post on 19-Dec-2015
215 views
TRANSCRIPT
Coal cheaper,but polluting
Much Eastern U.S. coal hashigh-sulfur content,more expensive to mine
Much Western U.S. coal haslow-sulfur content,cheaper to mine
But mining in semi-arid West
more damaging to land.
Effects on land
• Coal sludge releases
• Hardpan at strip mines
• Mountaintop removal
• Huge water use– Slurry pipelines
Effects on air
• Greenhouse gases– 3/4 sulfur dioxide– 1/3 nitrogen oxides– 1/2 carbon dioxide
• Toxics– Mercury– Uranium
Sources of Nitrogen Oxides
• Nitrogen oxides and sulfur dioxide create acid rain
• Tall stacks deposit farther
TransportationElectricalplantsOther
Advantages of natural gas
• Cleaner to burn– Half as much CO2 as coal
• More efficient– 10% energy lost
• 60-year supply at current rates
Disadvantages of natural gas
• Difficult to transport– Pipelines– Liquified Natural Gas (LNG) tankers
• Can be polluting, dangerous when extracted
• Methane bed drilling pollutes
Oil Consumption by Sector (1998)
24.6
9.2
2.13
1.16
0 5 10 15 20 25 30
Transportation
Industry
ResidentialCommercial
Electric Utilities
QUADS of Oil
Proven oil reserves
• 465 billion barrels consumed
• 1 trillion barrels left
• 22 billion consumed a year
• 45 years to go! Party now!
1800
2200
2600
Global Oil Production for Resources of 1800, 2200, and 2600 Billion Barrels
0
5
10
15
20
25
30
35
1950 1960 1970 1980 1990 2000 2010 2020 2030
Billions of Barrels per Year
Distribution of Estimates of Ultimately Recoverable World Crude Oil (1975-1993)
0
5
10
15
20
25
30
35
1400 1600 1800 2000 2200 2400 2600 2800
Billion Barrels
Percentage of Estimates
World Crude Oil Production
0
5
10
15
20
25
30
1950 1960 1970 1980 1990 2000 2010
Billions of Barrels per Year
World Crude Oil Prices(economic crises in oil states)
0
10
20
30
40
50
60
1970 1975 1980 1985 1990 1995 2000
$1992 per barrel
Global trends in oil
• Growing use in China (+10%/year)
• Japan, Europe depend on Mideast
• New reserves around Caspian Sea– Nearly size of Saudi Arabia
• Increasing source of major wars, human rights abuses
U.S. trends in oil
• Diverse sources (not Mideast)– Venezuela, Nigeria, etc.
• Opening domestic sources– Alaska controversy
• Polluting technologies?– Oil shale extraction– Synthetic fuels (coal-to-oil)
Oil in Ecuador
• Ecuador 2nd largest S. America producer– 70% of exports
• Drilling in Amazon rainforest
Opposition to oil companies
• Construction of roads, pipelines on Indian lands
• Displacement of Indians,• deforestation
• Oil leaks into rivers larger than Valdez spill
Ecuador Indian occupations
Texaco withdrew 1992,Arco met demands
Lawsuit againstTexaco inU.S. courts, 1999
Oil in Nigeria
Largest producer in Africa, mainlyIn Niger Delta
Nigeria had militarygovernments in 1990s
Environmental problemsin Niger Delta region
Homeland of Ogoni, Ijaw groups
Gas flaring hazards
Oil spills in mangrove swamp
Oil companies collude with military
Many Ogoni killed by military
Ogoni leaderDr. Ken Saro-Wiwa executed in 1995
Shell Oil pays,transports soldiers
Nigerian women protest, 2002
Protest against pollution, lack of local jobs
Ijaw womenoccupy Chevronoil docks
Websites on oil industryand global opposition
Rainforest Action Networkhttp://www.ran.org
Project Undergroundhttp://www.moles.org