Human Impact on the Environment 1. What is the definition of carrying capacity? 2. What is the approximate carrying capacity of this population? 3. What are two periods of time when population was greater than carrying capacity? 4. What are two reasons why the population might have decreased after these periods? Write in complete sentences! Don’t talk during the Catalyst!

Objectives By the end of today, all SWBAT…  Explain 4 ways that humans are decreasing biodiversity – Habitat destruction – Hunting – Invasive species – Global warming

Agenda  Planet Earth segment 1  Notes: decreasing biodiversity  Reading Jigsaw  Independent work (reading and answer reading questions)  Partner work (to fill out half of the graphic organizer)  Sharing findings as an entire group and PE segments 2- 5  Exit Question

Endangered Species  Endangered Species: a species whose numbers are so small that they are in danger of extinction  Endangered Species Act was passed in 1973 to protect these species

15,000 Species are Endangered

Planet Earth Segment: Saving Species  Watch the clip  Answer the questions to Part 1 on your classwork sheet

Humans Impact on Biodiversity  Key Point #1: HUMANS ARE DECREASING BIODIVERSITY in 4 main ways…  Habitat destruction  Invasive species  Hunting  Global warming

 Habitat destruction = when animal’s homes are destroyed to build farms, houses, or stores, or by pollution Habitat Destruction

Modern Amazon rainforest. 1% of the world’s original forest is lost every year!

Deforestation… for farmland

Deforestation… for Homes

 Invasive species = NON-NATIVE plants and animals that have a NEGATIVE influence on an area  Non-native: not originally from the area Invasive Species

Hunting

 Global warming = increase in average global temperature  Many negative effects:  Melting ice  Drought  Animals adopting weird behaviors Global warming

Group (4) Reading Jigsaw 3 steps: 1. Independently read and answer questions 2. With a partner – Compare answers – Complete your HALF of “3.6 Putting it all Together” 3. With entire group (4) fill in the remaining half of “3.6 Putting it all Together”

Reading Jigsaw Step 1  Independent reading time  Read  Answer reading questions

Reading Jigsaw Step 2  Combine with partner that read exactly the same thing as you  Discuss reading questions answers  Complete HALF of of “3.6 Putting it all Together”

Reading Jigsaw Step 3  As a group of 4 share your results and complete ALL of 3.6 Putting it all Together  Habitat Destruction  Invasive species  Hunting Planet Earth segment 2  Global Warming Planet Earth segment 3 and 4

Planet Earth: Vanishing Species Watch and answer movie questions  Poaching  Polar bears and global warming  Stemming the Extinction Tide  Which Species do we Save

Key Point Wrap-Up  There are 15,000 endangered species on Earth  Humans are decreasing biodiversity by:  Habitat destruction  Global warming  Hunting  Invasive species  Decreasing biodiversity reduces the stability of our world

Exit Questions 1. Describe in a complete sentence how habitat destruction impacts species biodiversity. 2. How is the polar bear threatened by global warming? 3. Describe how one specific animal species is being threatened by hunting. Write in complete sentences! Don’t talk during the Exit Question!