Ozone Layer and Global Warming

OZONE LAYER AND GLOBAL WARMING 13.2, 13.3 OZONE LAYER I. Good Guy Ozone (again) A Found in the ______B Protects us (and other animals and plants) from ______

II. Ozone Hole A The ozone layer is weakened by chemicals B CFCs = chlorofluorocarbons 1. Found in aerosol sprays, fridge and air conditioner coolant

III. Thinning of ozone layer A With less ozone, more ______gets through to the Earth B Effects on: 1. Humans 2. Plants a. ______3. Kills single-celled phytoplankton a. affects ocean ______b. increases ______4. Fish and amphibians a. ______IV. What can we do about the ozone hole problem? A Limit CFC use B Montreal protocol 1. Ban all CFC use by 1995 2. Ban all ozone destroying chemicals by 2000 3. Develop alternatives C BUT---- existing ______and free Chlorine molecules can continue to do harm for 60- 100 years

GLOBAL WARMING I. Greenhouse effect A ______act like windows on a greenhouse B They let in energy from the ______C They do not let out heat radiated from ______D Keeps the Earth warm enough to support ______

II. What are the Greenhouse gases? A ______1. From? ______B ______1. From? ______C ______1. From? ______D ______1. From? ______E ______1. From? ______III. Which greenhouse gas is changing concentration? A ______B Has always changed seasonally and daily. Why? ______C Now is increasing. Why? ______

IV. CO2 and temperature correlation A How is a correlation different from causation? B Does temperature seem to be more correlated with sunspots or CO2?

V. Effects of a warmer Earth A Change in Sea levels 1. Which could cause? ______, ______, ______B Change in Global weather patterns 1. More ______2. More/less ______C Harm to Human health 1. Allergies, increased # of vectors (mosquitoes) D Agriculture 1. Droughts 2. Decreased crop ______E Plants and animals 1. Change in range and composition 2. Lose ______

VI. What can we do to help? A Reduce greenhouse emissions B Kyoto Protocol (1997) 1. Reduce emissions to below their 1990 levels by 2012 2. Developing nations have adjusted goals 3. US? ______

VII. So what do you think??? A Is the Earth getting warmer? B Is it because of human activities? C Will it cause big problems? D What should we do about it?