2 The Water Planet Water covers over half of Earth’s surface (71%) SaltwaterFreshwater< 1% of the water on Earth is useable to us
3 Pollution of Freshwater Point SourcePollutionNonpoint Source PollutionComes from a known source or a specific locationExamplesFactory PipesSewage treatment plantDoes not have a particular point of originExamplesRunoff often carries nonpoint source pollutionRainfallSnow
5 Pollution in the AirThe chemical make up of the atmosphere helps to maintain life on EarthAtmosphere shields Earth from solar radiationFossil Fuel combustion is the major source of air pollutionCarsCoalOil burning power plants
6 Pollution in the Air continued… CFCs (Chlorofluorocarbons) destroy ozone layerProblem? Increase health problemsCO2 amts. in the atmosphere have increased since industrialization started in the 19th centuryCarbon cycle has since been altered which in return leads to unnatural warming of the atmosphereGlobal Warming
9 Land ResourcesEarth’s land provides soil & forests, as well as mineral & energy resourcesIrrigationsFarming new land (+)Depleting groundwater (-)Salinization (-) build up of salts in the soilMining (~500,000 in US)Essential for mineral resources (+)Messes up Earth’s surface (-)Destroys vegetation (-)What are land resources?Soil to grow foodForests for lumber, furniture, paper
10 Land Resources continued… Land for Disposal SitesLandfillsWhen done correctly little damage is doneWhen done incorrectly harmful wastes leak into the soil and groundwaterClearing of trees by clear-cutting = damaged landRemoving all the trees from a forestDestroys ecosystems
14 How to Protect What We Have WaterAir1970S the Federal Govn’t passed several laws to prevent or decrease pollution & protect resources1972 Clean Water Act1974 The Safe Drinking Water Act1970 Clean Air Act (most important air pollution law)Increased use of alt. energy sources help clear the airProtecting the land resources involves preventing pollution & managing land resources wisely.
15 How You Can Prevent Water Pollution How You Can Save EnergyNever pour household chemicals down the drain / toilet (cleaners, paints, thinners)Never dump toxic chemicals in the gutter into the groundDon’t put things that contain hazardous substances in the trash (batteries)Avoid using hazardous substances in the beginningRecycleLet the sun in to warm roomsUse energy – saving fluorescent bulbsLook for the Energy Star sticker when you buy electric productsTurn off lights when you leave the room. Turn off radio, TV, or computer when not in use