Week 12 Lecture

3 Pages
Unlock Document

Environmental Science
Jovan Stefanovic

Global Climate Change and Human Health The Earth’s natural green-house effect Energy from the Sun warms the Earth’s surface Energy radiate back toward space Water vapor (clouds), CO2, and other gasses are heated They radiate heat (longer-wavelength) in all directions (space or warms the air and the Earth’s surface) Green house gases Water vapor CO2 CH4 – concentration in air is very small N2O – concentration in air is very small Atmospheric CO2 level and global temperature Concentration of the greenhouse gases are directly proportional to temperature Processes affecting increase of green house gases Fossil fuels o – Electricity generated by coal 42% o – Transportation 24% o – Industrial process 20% o – Residential and commercial uses 14% Clearing and burning forests and grass lands – slashing and burning forests release carbon dioxide into the atmosphere Raising large number of livestock (methane) – manure releases methane when decomposed Planting of rice – nitrogen gases are released to fertilize rice Inorganic fertilizers – nitrogen fertilizers Largest emitters of CO2 1. China and Taiwan 24.4 % 2. US 22.2% 3. European Union 14.7% 4. Russia 5.6% 5. India 4.9% 6. Japan 4.6% 7. Germany 3.1 % 8. Canada 2.3% (four times the global average) Present problems 20 century was the hottest century in the past 1000 years Since 1861 the average global temperature of the troposphere has risen 0.70C 20 warmest years occurred since 1980 Glaciers and floating sea ice are melting and shrinking During the last century average sea level rose by 0.1-0.2 m Harmful or beneficial effects www.notesolution.com Direct (heat waves) and indirect (involve a complicated environmental process) Northern Europe is expected to be colder because Atlantic Ocean brings cold waves Ozone Depletion and Human Health Ozone depletion in the stratosphere Less ozone in the stratosphere will allow more harmful ultraviolet (UV) radiation to reach the Earth's surface Good ozone = filter for UVs (especially UVB and UVC – most damaging) Chlorofluorocarbons (CFC) and other chemicals – when they reach the stratosphere, they have been affected by the sunlight and release chlorine and fluorine, able to split all three molecules into oxygen molecule and elemental oxygen, so there is no ozone anymore to act
More Less

Related notes for EESA10H3

Log In


Join OneClass

Access over 10 million pages of study
documents for 1.3 million courses.

Sign up

Join to view


By registering, I agree to the Terms and Privacy Policies
Already have an account?
Just a few more details

So we can recommend you notes for your school.

Reset Password

Please enter below the email address you registered with and we will send you a link to reset your password.

Add your courses

Get notes from the top students in your class.