14.4 The Human Factor SWBAT compare and contrast the greenhouse effect and global warming; identify how humans impact climate

The Human Factor Earth receives energy from 2 sources” Sun Atmosphere Direct solar radiation Atmosphere Reflected solar energy stored in gases Carbon Dioxide Methane Water vapor

The Greenhouse Effect Greenhouse effect Retention of heat by the atmosphere Natural process caused by certain gases in the atmosphere (greenhouse gases)

The Greenhouse Effect Global warming A rise in global temperatures caused by an increase in greenhouse gases (especially carbon dioxide) which traps heat

Global Warming Increased temperatures could lead to” Polar ice caps melting Sea levels rising Flooding of coastal areas Deserts spreading Severe thunderstorms increasing

Global Warming Scientists agree that global warming is happening, but disagree as to the cause Natural changes (earth’s tilt, wobble, etc.) Increased carbon dioxide Where does it come from? What can be done to stop it?

Impact of Human Activities Increased carbon dioxide levels could be from: Automobiles Exhaust Burning fossil fuels Deforestation Mass removal of trees Photosynthesis uses CO2

Environmental Efforts To reduce environmental impact: Conserve energy Turn off appliances Turn off lights Turn down thermostat in winter Recycle Reduce fossil fuel use

With a partner Answer questions 1-5 on page 377 in complete sentences Finish for homework