environmental geography
north americans have transformed the land
-wheat, cattle, horses are not native, but produced
U.S. is the third largest consumer of water
- china #1, india #2
- US city dwellers consume 175 gallons daily
-drinking, cooking, showers,....
-water quality is becoming a problem.

Air modification (pollution)
-sources indistries, utilities, automobiles
Acid rain
-formed when sulfur dioxide and nitrogen oxide get into the water system.
-damages forests, poisons lakes, kills fish, erodes stonework.

Population and Settlement
-in 1492 columbus sailed the ocean blue
-before tat indigenous people lived in the americas. due to lack of written records estimates cary widely
-your texts says 3.2 mill. in US plus 1.2 mill. in Canada
1491: new revelations of the americas before columbus says 90 to 112 mill. including south america
in any case, 95% of them died after the europeas arrived (warfare and disease, especially smallpox)