Your Do Now 517 On sheet of paper

Your “Do Now” 5/17 On ½ sheet of paper answer following questions: 1. What is rate of change? 2. What does emigration mean? 3. Good weather helps plants reproduce no matter how dense the population. Is this densitydependent or density-independent? 4. How can you tell? 5. Give an example of a density-dependent factor

• Zero Pop Growth? • Fastest increase? • When will it cease to exist?

Agenda • • 5/17 TURN IN LABS!!! HUGE PART OF GRADE!! Video Notes Practice • Grade sheets back today (10 min till)

C H 15 Learning Target #4 5/17 • I can describe current human population growth and relate this to other factors

Notes #4 HUMAN POP. GROWTH

The world’s population (what do you think? ) • • Between 1 -2 Million people (GR = ~188, 000) Between 1 -2 Billion people US = ~311, 500, 000 We have already reached carrying capacity Overpopulation will not be a problem for another 1, 000 years or so

• Nat Geo • http: //www. youtube. com/watch? v=sc 4 Hx. Px. N r. Z 0 • One child • http: //www. youtube. com/watch? feature=pla yer_embedded&v=CKq. DUs. U 5 M 6 E

Earth’s carrying capacity for humans • Factors such as __energy, water, food, and space___ determine the carrying__capacity__ of Earth for the human population.

• The biggest problem we face: having the population grow faster than our supply of resources

Current human population trends • In recent history, the population worldwide has grown _exponentially__

What type of curve is this? Why?

• 200 years ago, the world’s population was at 1 billion • Today it is over __7 billion__

• Several factors allowed this increase to happen, including – modern agriculture and medicine which have allowed people to live longer, survive more diseases, and harvest more food

Effects of Overpopulation • Overpopulation: a condition where the population is above carrying capacity

Many places are becoming overpopulated, which can make problems worse because of: • 1. ) Depletion (running out) of resources (ex: water shortages)

• 2. ) Problems with Safe Waste Disposal (ex: not enough sewage removal & treatment)

3. ) Increased Amounts of Pollution (ex: more chemicals in air & water as fossil fuels burned for energy)

The bottom line • As populations continue to grow and we continue to use resources, humans will reach carrying capacity. • When resources run out, we expect to see a population crash (many people dying) • Nobody knows when the resources will run out

Possible solutions to this problem: