Imagine Magazine - Johns Hopkins - January/February 2011 - (Page 22)

Clean& Anyone who ever rafted down a river, fished from a riverbank, or even simply watched coursing water from a bridge above knows how powerful rivers can be. For thousands of years, humans have built dams across rivers to store water for drinking and irrigation, and to prevent the flooding of land downriver. In the late 19th century, dams began serving another purpose: generating electricity. Today, hydroelectric dams generate nearly one fifth of the world’s power supply. Although hydroelectricity creates no waste or emissions, it does have environmental impact. Dams can prevent fish from migrating and nutrients from flowing to wetlands downstream. Reservoirs flood areas that might include critical habitat. In addition, people and communities are often displaced when a reservoir is created. Across the globe, the need for clean, renewable energy is coming into conflict with environmental and social needs. The following articles illustrate how this dilemma has played out in two different countries. Each author arrives at his own conclusions. As you consider the issues raised in each story, we invite you to do the same. vECTORSTOCK SHUTTERSTOCK 22 imagine Jan/feb 2011

Table of Contents for the Digital Edition of Imagine Magazine - Johns Hopkins - January/February 2011

Imagine Magazine - Johns Hopkins - January/february 2011
Big Picture
In My Own Words
Becoming Environmentally Eloquent
Bacteria vs. Polystyrene: Getting the Toxins Out
Feat of Clay
What Lies Beneath
Clean & Green?
Ocean Embrace
Selected Opportunities & Resources
Making the Most of Public School
Word Wise
One Step Ahead
Exploring Career Options
Off the Shelf
Planning Ahead for College
Students Review
Creative Minds Imagine
Mark Your Calendar
Knossos Games

Imagine Magazine - Johns Hopkins - January/February 2011