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Transcript of Humans & the Environment. What do you think would be the consequences of exceeding Earth’s...
Humans & the Environment
What do you think would be the
consequences of exceeding
Earth’s carrying capacity for the
human population?
• Overcrowding• Shortages of food, water, and fuel
• Malnutrition• Increased disease
What role does the forest play in the environment?
–Makes products–Removes CO2 & produces 02
–Stores nutrients–Provides habitats & food–Limits soil erosion
Renewable vs. Nonrenewable
Type of Resource
Renewable Nonrenewable
Definition
Examples
Renewable & Nonrenewable Resources
• Renewable Resources– Can Regenerate & be replaced– Not necessarily unlimited
• Nonrenewable Resources– Cannot be replenished by natural processes
Examples
Renewable Resources
TreeCorn
WaterSoilFish
Chicken
Nonrenewable Resources
CoalNatural Gas
OilCopper
Iron
Sustainable Use
A way of using natural resources at a rate that does not deplete them.
ResourcesRESOURCE ROLE OF RESOURCE NEGATIVE IMPACT POSITIVE IMPACT
(Sustainable Development)
Forest Makes productsRemoves CO2 & produces 02Stores nutrientsProvides habitats & foodLimits soil erosion
DeforestationLoss of forests which can cause severe erosion
Replant treesBreeding new, faster- growing tree
Land
Ocean
Air
Water
Let’s Work!Look at page 145- 149 to finish
your chart.
Humans & the Environment
Part 2: Biodiversity
BIO DIVERSITY
INTERESTING FACTS• “Scientists estimate that there are between 10 million to 100
million organisms on Earth. Only 1.4 million have been indentified.” -Science Q&A Ecosystems
• “About 118 of the top 150 prescription drugs in America contain chemicals derived from plants, fungi and other species.” -International Biodiversity Observation Year
• “Insects pollinate crops worth $6-12 billion a year in the USA.”-International Biodiversity Observation Year
• “Scientists estimate that species extinctions are occurring 100 to 1000 times faster than without human influence. Without a change in our actions half of the world's species may be lost by 2100.” -International Biodiversity Observation Year
• “In the USA alone, nearly 4,500 known species are threatened with extinction.” -International Biodiversity Observation Year
Look at pages 150-155!
BIODIVERSITY:
VALUE
THREATS
CONSERVATION:
sum total of the genetically based
variety of all organisms in the biosphere
STRATEGIES
CHALLENGESTo describe the wise
management of natural resources &
Preservation of habitats and wildlife
• Endangered Species Preservation Act
• Captive Breeding Programs
• National parks, forests, & other protected areas
• Saving the tropical rain forests in developing
countries• Locating problem areas
(“hot spots”)• Making a priority list
• Earth’s greatest natural resource• Food
• Industrial products • Medicines
• Altering habitats (Habitat Fragmentation)• Hunting species to
extinction• Introducing toxics to food
webs• Introducing invasive species