31 Water CycleEcosystems maintain a supply of water to survive
32 Carbon Cycle Animals take in oxygen and release carbon dioxide (Cellular Respiration)Plants take in carbon dioxide an release oxygen(Photosynthesis)
33 Nutrients Recycle Plants use nutrients in the soil to grow Nutrients are transferred through food chainDead and waste of organisms are recycled and put back into the soil by decomposers(Bacteria and Fungi)
34 Aim How do people affect the way ecosystems function?
35 The Flow of EnergyEnergy is passed through the environment but NOT recycledEnergy pyramid loses large amount of energy to heatSun is constant source of energy
36 Population GrowthThe population levels off as it reaches an ecosystems carrying capacity
37 Direct HarvestingDestruction or removal of a species from a habitat which can lead to extinctionAn example is when an exotic animal is removed for a pet( Cute monkey or parrot)
38 Invasive SpeciesWhen people remove a species from one environment to anotherThey become pest because they usually have no natural enemy and multiply quickly
39 Land UseAs human populations grow we need more resources to make things we need(clothes, MP3 players and cars)Need more space for factories and homes
40 Deforestation Need to clear land to make homes and factories This leads to habitat destruction
41 Leads to Loss of Biodiversity Direct HarvestingImported SpeciesDeforestation
42 Aim What is the impact of technology and industrialization on the environment?
43 IndustrializationThe development of an economy in which machines produce our products
44 We Need PowerBurn fossil fuelsNuclear fuels (splits atoms)
45 Power Plants Cause:Water pollutionAir pollution
46 Water Pollution Sewage from a power plants can act as a fertilizer Plants bloom using up oxygen resulting in fish suffocating
47 Toxic Waste Poisonous waste dumped in rivers end up in the food chain Many organisms are killed as a result of these toxins
48 Air Pollution Burning fossil fuels leads to Increase in CO2 levels (Global Warming)Acid rainSmog
49 Aim How will the choices we make today affect our environment tomorrow?
50 Advances in Technology New factoriesIncrease crop yieldEfficient carsNew Computers and iPods
51 Technology Creates Problems Mainly environmentalThere is a cost to everythingFor each new technology we must assess the risk
52 A trade-off We have to analyze the cost verse the benefit Is it worth it?(Pros and Cons)
53 Today's decisions affect our future The decisions we make today will affect our future environment
54 Decisions have Consequences The trade off was power produced verses a possible nuclear accidentWas it worth it?