Human Population • Rapid increase in human population leads to: • Great demands on Earth • Population grows when- _____ rate is higher than ______rate
Human Population- Effects • Lack of ____in some countries • Forests & moutains being ruined for _______ • Destruction of tropical forests Add:
Pollution • We need to: • Produce fewer _____ • Clean up wastes we produce • May have to live w/less ________growth
Pollution • __________-can be broken down by microrganisms- into the nutrients they were made from • Examples: sewage, scraps of food, certain paper items
Pollution • Nonbiodegradable- cannot be broken down by ______processes- or is done very slowly • Examples: glass, certain plastics, metals, radioactive wastes, DDT, pesticides, etc…
Biological ___________ • Primary producers pick up non-bio. pollutants from water • Concentrate & stored in tissues • Herbivores eat producers • Carnivores eat herbivores • ___________further- dangerous!
Air Pollution • Invisible • _____- smoke & fog • Differences in LA & Midwest • Acid Rain • Pollutants combine w/H2O vapor • Effects felt in many ways
Air Pollution continued • _________effect • CO2 in air from burning of wood & ________ • CO2 absorbs heat energy & traps it in to the biosphere • “Heat _______”
Water Importance • 75% of Earth = WATER • ___fresh, 97% salty/ocean • Only small amount of 3% is usable
Water Pollution • Chemical wastes • Raw sewage • ________pollution- heated H2O from factories released into aquatic environments • Oil spills • Ocean Acidification
Fate of the Earth • Reforestation • Planting new trees when old ones cut down, speeds up What? _____ • ___________Species • Many getting dangerously close to extinction
What can We DO? • Government- special lands set aside for conservation • Certain groups protect single species • Education- some products may cost more- it is worth it!