Human Overpopulation

" How to share and renew resources
" Energy Conservation
" Managing waste
" Managing populations
" Loss of fertile lands (desertification, topsoil loss)

Loss of Biodiversity (Extinctions)

" Deforestation
" Urban Sprawl
" Endangered Species Act
" Illegal Animal Trade
" Exotic (Invasive) Species
" Overfishing

Global Warming

" Greenhouse Gases
" Is global warming happening?
" How will it affect life on the planet?

Air Pollution / Water Pollution

" Acid Rain
" Clean Air Act
" Nitrification of Lakes (Runoff)
" Sources of Clean Water
" Ozone hole (Chloroflourocarbons)
" Toxins in the environment (DDT) & biological magnification