CIVTECH 3CS3 Lecture Notes - Lecture 11: Chlorofluorocarbon, Ecotourism, Aspirin

• School: McMaster University
• Department: Civil Engineering Infrastructure Technology
• Course: CIVTECH 3CS3
• Professor: Jonathan Sussman

Document Summary

Human activities sped up the change in climate; climate changes which occur naturally are acceptable however. In sections of global temperature graphs over periods of years where cold parts are displayed are called glaciations and are very long (100 000 years). On the other hand, the warmer periods were called interglaciation period which were relatively brief (10 000 to 20 000 years) The last ice age was approximately 12 000 years ago. Energy from the sun warms the earth. Water vapour (clouds), co2 and other gases are heated and they then radiate the heat in all directions (either into space or warms the air and the earth"s surface). Examples of green house gases are: water vapour, co2, ch4, n2o. Ch4 (methane) increased and is leveling off. Nitric acid increased significantly but is leveling off. There is a correlation (positive) between carbon dioxide and increased temperatures.