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Lecture 10

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Department
Earth Sciences
Course
EARTHSC 2WW3
Professor
John Macclean
Semester
Spring

Description
April 2  2014 Earth Science 2WW3 – Lecture 10 Water in the Environment Outline • A bit about water economics • A little about the future of water • The Great Pacific Garbage Patch • The exam Water value • The value of an economic resource ↓ Water demand 1. Value needs to be recognized 2. A value needs to be demonstrated • Consumption demand 3. Values then needs to be embedded into decision making • Production demand ↑ Water supply Water Pricing • Surface water • Unlike oil and orange juice water scarcity doesn’t correspond directly to increased prices o Water as an Economic Good  Consumers take low price to be equivalent to the true value o Pricing Water  Too simplistic? o Water Tariffs  Only in some countries April 2  2014 The Future of Water • Water Footprint o Most consumption from green water footprint o Intensively manufactured products use blue and/or grey water • Calculate? April 2  2014 April 2  2014 April 2  2014 April 2  2014 Great Pacific Garbage Patch • Large mass of solid debris floating in the Pacific Ocean • Located within the North Pacific Subtropical High, an area between Hawaii and California • Estimated to be the same size as Texas • Created from currents running through the North Pacific gyre • Composed of approximately 80% plastic and weighs over three million tons North Pacific Gyre Transportation Routes • Human waste transported from land and also  dumped from  the ships on the water • The plastic debris goes through weathering  process in the  water April 2  2014 Components of Plastic Debris • Plastic is a petroleum based product • Made to be durable and tough • Once plastic goes through weathering processes it becomes brittle Plastic Chemicals • Hydrophobic Chemicals o Inputs • Additives, monomers and oligomers o Outputs • Plasticizers o The largest group of additives in polymers, range from molecular weights of approximately 200  to almost 700 g mol–1 and cover water solubility from g l–1 to sub­mg l–1.” (Teuten et al., 2009,  p.2029). Summary of Desirable Properties in Modern Plastic Materia
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