Key Issue # 1: Why are resources being depleted? Environment Key Issue # 1: Why are resources being depleted?

Animate Power

Inanimate Power Generated from machines 3 of the earth substances provide 5/6 of the world’s energy: oil, natural gas, and coal Fossil fuels Biomass fuel

Coal to Natural Gas Industrial Revolution – Petroleum was first pumped in 1859, but was not an important resource until the diffusion of automobiles Natural gas was originally burned off as a waste product of oil, but now it heats millions of homes

Energy is used in three places Businesses – U.S. businesses primarily use coal Homes – heating of the living space and water is primarily done with natural gas Transportation – almost all transportation systems operate on petroleum products

Two Major Concerns Supply Uneven Distribution

Remaining Supply of Fossil Fuels Proven Reserve – the amount of energy remaining in deposits that have been discovered Potential reserve – the energy in undiscovered deposits that are thought to exist

Expanding Production Extracting proven reserves will grow to be more difficult Unconventional sources

Location of Reserves Coal – forms in tropical locations, in lush, swampy areas rich in reserves Today’s supply of coal is found in mid-latitudes Oil and Natural Gas – formed millions of years ago from sediments on the sea floor Five Middle Eastern countries have 2/3 of the world’s reserve – Saudi Arabia, Iran, Iraq, Kuwait, and U.A.E. Venezuela and Mexico

Consumption of Fossil Fuels PEDs, with ¼ of the world’s population, consume about ¾ of the world’s energy Two Geographic Consequences for the future: PINGs will consume more energy in the future; world consumption will rise Because PEDs consume more than they produce, they must import fossil fuels, especially petroleum, from PINGs. * Since PINGs will need more energy, PEDs will face more competition in the future for obtaining the remaining reserves of fossil fuels

OPEC Policies During the 1970s Organization of Petroleum Exporting Countries (1960) Gas Crisis of the 1970s Internal conflicts weakened OPEC in the 1980s and 1990s

Changing Supply and Demand Conservation Low prices in the 1990s Rise in prices in the 21st century Petroleum will not run out during the 21st century, but the cost of extracting it will rise, and alternative energy sources will rise

Natural Gas Cheaper to burn and less polluting than petroleum and coal World natural gas consumption increased 4% per year during the 1980s, and is currently increasing about 3% each year The two major sources of reserves Iran Russia

Air Pollution Burning coal creates several pollutants: sulfur oxides, hydrocarbons, carbon dioxide, and particulates (soot) The U.S. Clean Air Act now requires utilities to use better-quality coal or to install “scrubbers” on the smokestacks

Mine Safety Mining is an extremely dangerous occupation Miners are also prone to “black lung” disease Strictly enforced mine safety laws, improved mine ventilation, intensive safety programs, automation of mining, and a smaller workforce have made the American mining industry much safer

Subsidence and Erosion Underground mining may release acidic groundwater into streams Sinking of the ground could damage buildings Erosion – the removal of trees in order to mine for coal could cause erosion

Economics Coal must be shipped a long ways because factories tend to be a long ways from the coalfields The principal methods of transporting coal – barge, train, or truck, all require petroleum A lot of energy is expended so that coal can be used

Nuclear Energy The Big Advantage = the large amount of energy that is released from a small amount of material Nuclear power supplies about 1/6 of the electricity in the world Europe – heavily dependent upon nuclear In the U.S. -

Potential Accidents Fission Radioactive waste Elaborate safety precautions Chernobyl (1986)

Radioactive Waste Plutonium No one has developed permanent storage for nuclear waste The U.S., has not found a safe place underground because of worry about groundwater

Bomb Material Nuclear power has been used in warfare twice, in August 1945 when the U.S. dropped an atomic bomb on Hiroshima and then Nagasaki The Soviet Union, United Kingdom, France, China and India have all tested nuclear weapons

Limited Uranium Reserves Proven uranium reserves are limited – about 60 years Breeder reactor – turns uranium into a renewable resource by generating plutonium, also a nuclear fuel Plutonium is more lethal than uranium

Cost Nuclear power plants cost billions of dollars to build The complexities of safe uranium transportation add cost

Earth’s Crust 92 natural elements, but 99% of the earth’s crust is composed of eight elements – oxygen, silicon, aluminum, iron, calcium, sodium, potassium, and magnesium Oxygen accounts for nearly ½, and silicon nearly ¼ The eight most common elements combine with more rare ones to make about 3000 different minerals

Minerals as Resources Each mineral is potentially a resource if people find a use for it The definition of which minerals constitute resources evolves as technology and economies change

Deposits Mineral deposits are not uniformly distributed across the world Most of the world’s supply of particular minerals is found in a handful of countries