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Lecture 11

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Environmental Science
Nick Eyles

Lecture 11th3 hour Final multiple choices Exam Wednesday April 25 2012 Based on Chapters 1 to 3 11 19 20 Lectures 10 and 11 120 questionsFig 206 Rodinia at the top everything is coming together and then that breaks up This is the beginning of the Wilson cycle On the right hand side of the third picture is Africa coming in which is the beginning of Pangea and thats going to collide So all the actions is happening on the Eastern side of North America Then the Atlantic opens and then all the other geologic actions happen on the Western side of North America How the diagram worksAn Urban World The Age of Construction Why do we need to know how the world works or study environmental science We need to apply this knowledge in the real world to make the planet more habitable We need to understand real world systems how they work and how we are changing whether its climate ocean circulation soil lost etc The really big one is that we are in an age of construction The planet is turning into an urban planet Everyone is living in cities Almost 80of people are living in cities Those cities create what we call an urban shadow that reaches far beyond the cities in terms of to supply water energy resources to the urban areas and then we got to get rid of waste products Many of our environmental problems worldwide are simply due to the growth of these enormous super cities Super citiesany city more than 10 million people The very influence of this allows these cities to grow such as productivity to harbors rivers lands are often a result of geology They are all often in plate tectonic areas that are active The vast majority of super cities are all affected to volcanoes A lot of them are in the Pacific rims and so the risk from natural hazard is increasing dramatically Theres more volcanic eruption theres more earthquakes and you have these fixed population sitting there in one of the active areas More people are killed by earthquakes than by diseaseSome of the most rapid environmental changes that we know that are on the planet are happening on the margins of continental areasWelcome to the Anthropocene The Epoche of Man There is a new geologic period of people that introduces its called the anthropocene which is really our age which means the Epoche of man If you were to define a period which is now dominated by our influences on the environment we shift more sediment every year than rivers We are changing the chemistry of the atmosphere When would you say that actually began When do you think the influences of man and woman actually began to have a profound effect on the environment The Industrial Revolution which is the late 1870s where the invention of the steam engine was created which is the real beginning of the Anthropocene On the picture this is North Toronto and we now have a built landscape This is made out of fore You are dealing with material called fill which is all the material of waste material we brought into urban areas to level areas for new constructionTo Meet Challenges of Changeeg Urban sprawl Managingprotecting water resources and watersheds waste nuclear municipal industrial etc Remediation of contaminated sites Radon gas Earthquakes landslidestsunamis Mitigation of climate warming effects Environmental impact of resource extraction and energy supplies oil sands coal etc Environmental policy and planning We need environmental scientists We live in a very rapidly changing environment These are some of the issues that environmental scientist are interested in Urban sprawlswhat we call a hardening of watersheds You are replacing natural soils which allows are water to infiltrate The hardening of watersheds is by building buildings with roofs with ash build roads so your changing what we call a hydrologyThe way in which the watersheds functions This is the emerging issue both in terms of water quantity there isnt enough in
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