2 Earth’s Human Population Continues to Grow Technology has helped to increase Earth’s carrying capacity.Earth’s human carrying capacity is unknowngas-powered farm equipmentmedical advancementsclean waterpublic assistance
3 Overpopulation Over 6.6 billion people Many natural resources are nonrenewableFossil fuels take millions of years to formMore people means:1) More forests removed2) More resources consumed3) More CO2 released
5 MUST BE MANAGED EFFECTIVELY!!! Earth’s Natural ResourcesThe growing human population puts pressure on Earth’s natural resourcesMUST BE MANAGED EFFECTIVELY!!!Nonrenewable resources are used faster than they can form or be replenished:CoalOilNatural GasRenewable resources cannot be used up or can replenish themselves over time :WindSolarWater
6 Ecological FootprintDefined: the amount of land needed to support a person.The land must produce and maintain enoughfood and watershelterenergywasteSeveral factors effect size:Amount/efficiency of resource usedAmount/toxicity of waste produced
7 Caused by human activity? What are someEnvironmental issuesCaused by human activity?
9 Smog and Ground-Level Ozone Causes:Burning of fossil fuels & industryParticulates rise into air and react with sunlight to make air pollutionEffects:Ozone gas (O3)is poisonousRespiratory illnessSolutions:Reduce use of fossil fuelsAlternative energy sourcesPlant trees
10 The Greenhouse Effect G.H.E. is naturally good (it warms Earth) Causes: CO2 from burning of fossil fuels (coal, oil, natural gas)Effects: Excess heat trapped near the earth’s surface may change global climate patterns; ice caps meltSolutions: Reduce use of fossil fuels, plant trees, alternative energy sources
11 What’s a Greenhouse?A Greenhouse is designed to trap heat so you can grow plants year round, even in cooler environments.heatSome heat escapes the greenhouse, but enough is trapped to keep the inside warmheatheatheat
12 Earth Some heat escapes into space CO2 heat Some heat naturally trapped by CO2 and other greenhouse gasesCO2heatThe Natural Greenhouse Effect is good for life on Earth.heatheatCO2CO2CO2CO2CO2heatCO2CO2CO2EarthCO2CO2
14 Earth More heat trapped near Earth’s surface Less heat escapes into spaceCO2heatCO2heatheatheatheatCO2CO2CO2CO2CO2CO2CO2CO2heatCO2CO2CO2CO2CO2CO2CO2CO2Excess CO2 in atmosphereCO2CO2CO2CO2CO2EarthCO2CO2CO2CO2
15 The Greenhouse Effect is naturally GOOD! Mars: No Greenhouse EffectEarth: Balanced Greenhouse EffectVenus: The Extreme Greenhouse EffectLittle heat is trapped by the thin CO2 atmosphere. High temperatures can be around 20⁰F.Heat is trapped by the thick CO2 atmosphere. Temperatures reach 750⁰F.Average global temperature is 57⁰F.
16 Acid Rain Defined: Precipitation with a below normal pH Cause: Fossil fuel pollution rises into the air & then falls as rainEffects:Waterways more acidicKills plant and animal lifeSolutions:Reduce fossil fuel usageAdd buffer (base) to waterways
20 Water pollution Defined: pollution in water supplies Causes: Waste MedicinesAgricultural RunofffertilizerspesticidesProblems:Species lostEcosystems harmedSolutions:Manage waste
21 Water pollution affects ecosystems Indicator species: Give sign of ecosystem’s healthExample:AmphibiansFrogs are good indicator species because their skin is water permeable.Top predatorsSolution: Waste Management
22 Biomagnification Defined: Accumulation of toxins in the food chain Fat soluble pollutants move up food chain.These pollutants stay in the body fat of an organismPredators eat contaminated preyPollution accumulates at each level of the food chainTop consumers, including humans, are most affected.
23 Deforestation Defined: Clearing of forested areas Causes: Harvesting/destroying forests for high demand:Wood productsCreating farmlandEffects:Species lostExcess CO2 releasedSolutions:RecycleImproved farming techniques
25 Introduced & Invasive Species Defined: Foreign organisms are introduced to a new habitatInvasive: harms native speciesCause:Foreign species introduced to new environmentEffects:Foreign species outcompete native speciesFood webs unbalancedEconomic damageSolutions:Laws preventing foreign goods into new countriesIntroduce predatorsZebra musselsMiceKudzu vines
26 What is being done? The Environmental Protection Agency (EPA) Created in 1970Works to protect speciesClean Water ActClean Air ActEndangered Species ActThis recovered the bald eagleThose listed are called “Umbrella Species”Entire habitats protected
27 ReviewCFCs are manmade chemical responsible for the destruction of theWhich gas is a main contributor to the greenhouse effect?Crop damage and cancers are caused by an excess amount of which type of energy? __________________Name the big three fossil fuels:Which planet has excess temperatures because of a thick CO2 atmosphere?What is smog?How are pollutants passed through the food chain?Where is ozone gas harmful to life?Where is ozone gas helpful to life?What makes a resource nonrenewable?Food webs become unbalanced as a result of the introduction of which type of organisms?What is an umbrella species?