Secondary Effects
Primary cause vs. secondary effects
The primary problem is overpopulation.  Secondary problems caused by overpopulation are global warming, deforestation, air pollution from factories and cars, urban runoff leading to water pollution, among several others.  This organization, One less child.org, is focusing on the primary problem, because not until this is addressed will significant change occur on the secondary problems.
Human water demand
Speaking of river dams, the Colorado River no longer flows any water to its delta in Mexico.  Humans already consume ALL of the water in the Colorado River watershed, about 240,000 square miles, tapped dry by 16 dams or aqueducts.  Think about that.  In an area the size of Arizona, Utah, and Colorado combined, humans use every raindrop or snowflake that falls from the sky.
Water & coastal pollution facts
Source: Surfing magazine, Oct 2007, p80
 
53% of the US population lives in coastal counties on 17% of the land.
One part of motor oil contaminates one million parts of ocean water.
50% of US dog owners do not pick up after their pets.
1.5 million people get sick from bacterial pollution in Los Angeles County annually, mostly from urban runoff.
Urban runoff
Chicago, IL USA Philadelphia, PA USA
After looking at the photos of major cities from space, it is easy to imagine how a large rainfall now equates to a flushing of a very large toilet. Large cities now sprawl concrete over 1,000 to 10,000 square miles of land. All of the associated motor oil, industrial waste, trash in the streets, and fertilizers are washed into streams, lakes, and into the ocean.

According to November 2006 issue of Science, all fish and seafood species are projected to collapse by 2047. This is party caused by the increase in carbon dioxide that will be absorbed by the oceans, creating increased carbonic acid, and harming the plankton at the bottom of the ocean's food chain.  In 40 years, how do we justify killing everything in the ocean?

Out of control production, consumption, and profit
In most cultures today, children are conditioned to be consumers of products, to learn the values of money, earning, and spending. However, production and consumption are now out of control.

LP's, CD's, and cassettes as an example of profit-based thinking

"Immediate profit" items are quickly obsolete and never decompose. If one artist sells 3 million copies of one CD, how many total LP's, cassettes, and CD's have been sold in the last 100 years?
Oil companies & large corporate attitude change
If the oil companies and large corporations continue to manipulate the public and the governments solely for profit reasons, the Earth will continue to suffer environmental harm on a global scale. The CEO's and executives of these companies go home to their families, which they themselves are responsible for long term environmental damage and threats to their own family's well-being.
Consuming more and more of the land
Road Kill The public's apathy towards animals killed by cars is wrong. Road kill is an obvious visual example of human encroachment and habitat destruction.
 
Wetlands Destruction 90% of California's native wetlands have been destroyed, a direct effect of our cancerous growth.
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Mission Statement
Overpopulation
Population Growth
Secondary Effects