Presentation on theme: "A Look at Energy Welcome to SCI 204, Environmental Science"— Presentation transcript:
1 A Look at Energy Welcome to SCI 204, Environmental Science In this presentation we will look atFossil FuelsTransition FuelsAlternative FuelsRenewable Sources of EnergyWhich fuel source is best
2 What is the primary source of energy for human civilization? is the burning of fossil fuels recovered from underthe earth’s surfaceFossil Fuels are composed of HydrocarbonsThey found in solid, liquid and gaseous statesSolid hydrocarbon fuels is mined as coalLiquid hydrocarbon fuels is drilled as petroleumGaseous hydrocarbons is piped as methaneIn addition, Fossil Fuels can be processed as intoalternative physical states as syn fuels, includingCoal liquification and gasificationPetroleum from oil shale and tar sandsMethane transported as liquid natural gas
3 What are the Advantages and Disadvantages of using Fossil Fuels for Energy?The advantages of fossil fuels areBang for the buckTransportability as energyVersatility as a fuelA long standing traditionAn existing superstructureThe disadvantages of fossil fuels areProcessing creates supply limitationsResource may be limitedBurning fossil fuels produce an undesirable by product of greenhouse gasesMining fossil fuels produces significant quantities of hazardous and toxic wasteStrip mining of fossil fuels destroys entire ecosystemsAs a chemical released into the evironment (i.e. oil spills, leaking methane and coal dumps) it is a toxic pollutant
4 Crude oil released into the environment through oil spills is an insoluable toxic sludge— —which kills wildlife by covering them with an immobilizing, insoluable coating; poisoning them when ingested, and asphyxing them by clogging air ways. The toxic residue can remain for generations.
5 Are there Alternative Energy Forms which could Replace Fossil Fuels? There are many alternative energy forms whichcould replace Fossil FuelsBio-fuels (including alcohols and biodiesel fuels)Geothermal energyNuclear energySolar energyWind PowerAlternative Fuels can be classified asNon-renewableRenewablePertpetual
6 What is a non-renewable fuel? A non-renewable fuel isA fuel which cannot be replaced in a meaningful timeA fuel, which, having been consumed, it is unavailable for an indefinite length of timeA fuel whose conumption rate is greater than its rate of its productionExamples of non-renewable fuels includeLiquid fossil fuels, like heavy crude oilSolid fossil fuels, such as bituminous coal, and uraniumAging fossil fuels, including peatGaseous fossil fuels, like Methane gas deposits
7 What is a Renewable Fuel? A renewable fuel isA fuel which can be replaced in a relatively short timeA fuel, which, having been consumed, it becomes available again through natural processesA fuel whose replacement rate is greater than or equal to the rate of its consumptionExamples of renewable fuels includeAlcohols, such as ethanol, are produced from plant sugars using corn, sugar beets, soy or sugar caneOther biofuels, like biodiesel fuels, use processed plant by products such as vegetable or wood oilsMethane, also called natural gas, can be created from decomposing animal waste, land fill settling, and microbe culturesBreeder reactors, which produce plutonium as a waste
8 What is a perpetual fuel? A perpetual fuel isA fuel which is continuous availableA fuel, which, having been consumed, it remains immediately available through natural processesA fuel whose replacement rate is greater than or equal to the rate of its consumption with no time factor to be consideredExamples of perpetual fuels includeSolar energyWind powerHydro power, including hydroelectric dams, tidal stations and river generatorsNatural earth heat sources, such as geothermal energy
9 Wind power can be generated from a single propeller tower built on home lots only 35 feet in height— —Or it can be generated from multiple propellers suspended in 150 mph gulfstream winds at a height of 35,000 feet.
10 What is a clean fuel? A clean fuel is one which When used, does not produce a polluting by productWhen processed, does not produce a polluting by productWhen processed or used, the by products are considered harmlessExamples of clean fuels includeHydrogen, in which its use produces waste waterSolar power, in which its use produces excess heatHydropower, where the use has no by productsWind power, where the use has no by products
11 Some fuels are controversial Particular fuels whose use is controversial areFissionable Uranium, used in nuclear burning reactors, does not produce greenhouse gas waste—however, it does produce relatively small amounts of radioactive waste as a by productFissionable Plutonium, used in nuclear breeder reactors, does not produce greenhouse gas waste and can be processed and reused—however, its form is such that it can be used for the production of nuclear weapons & explosivesHydroelectric Dams, used to generate hydroelectric power from the flow of water, produces no by products—however, the reservoirs require sizable acres of land to be permanently covered in water, and significant amounts of greenhouse gas are produced in the making of concreteSynfuels, burn cleaner than regular fossil fuels—however, their mining requires major ecosystem destructionHydrogen fuels have a by product of water—however, it requires more energy to process than is released in its use
12 Give all the advantages and disadvantages of the different fuel sources, which one is best? It is a general consensus among environmentalistsand industrialists concentration on one singlesource as a fuel is not wise becauseThe massive growth rate in energy consumption will make any single source of energy into a nonrenewable environmental problemThe massive growth rate in energy consumption will make it impossible for the energy industry to keep pace if has only one fuel source which can be processedThe industrial economy would be held hostage by a virtual monopoly of fuel source providersIt is the general consensus that all energy fuels should be considered on an individual basis, and that the energy source selected should match the need of the interested consumer