Title: Your group letter is on your desk 23 per group Take an index card with writing and a blank index car
1 (No Transcript) 2 (No Transcript) 3 Your group letter is on your desk!2-3 per group Take an index card with writing and a blank index card
You have 10 minutes to
1. copy the card onto a new index card- including your group names.
2. Answer/define/give the main idea for your topic as briefly as possible
20 minutes- to include your main ideas on the PowerPoint
Either type or write
I will help with this part
4 Overpopulation Effects of Environment
By 2050 if population reaches 9 billion there will be serious damage to the environment as well as the global economy.
Hopefully technology and science will help prevent the negative impacts.
5 Forest Resources
Deforestation-(loss of forests) leads to severe erosions as soil is exposed to heavy rains (erosions can also wash away nutrients in top soil.)
Sustainable use- mature trees can be harvested selectively to promote the growth of younger trees and preserve the forest ecosystem.
Tree genetics are also breeding new faster-growing tree varieties that produce high-quality wood.
6 Introducing New Species
Introducing new species is when humans transport a species new to that environment to an area.
This is harmful to the environment because there are no natural predators to hunt the new species and the new species might have advantages over the native species.
Examples Zebra mussels and leafy Spurge are brought from Europe to New York.
7 Water Resources
Oil Spills improperly discarded chemicals enter streams and rivers.
Domestic Sewage wastewater from sinks and toilets contain nitrogen and phosphorous compounds that can encourage the growth of bacteria and algae in aquatic habitats.
8 Effects of Humans on Land Resources
Desertification- in areas with dry climates a process caused by a combination of poor farming produces overgrazing and drought that turns productive land into desert.
Soil Erosion- the wearing away of surface soil by water and wind.
9 Global Warming
Global warming the term used to describe the increase in the average temperature of the biosphere.
Cause The most widely accepted hypothesis that human activities have caused global warming by adding carbon dioxide and other green house gas such as methane into the atmosphere. As result global atmospheric green house retain more heat.
Polar ice caps will melt
Rise of sea levels
10 Oceans Resources
People depend on the ocean as a major source of protein both from finfish.
The annual world fish catch grew about 20 million tons to more than 90 million tons between 1950- 1990
Fisheries are being harvesting faster than they can reproduce.
Aquaculture- the farming of aquatic organisms
Fish catches kept rising
Earths oceans are particularly valuable for the food resources they contain.
11 Biological Magnification
Increasing concentration of a harmful substance in organisms at a higher trophic levels in a food chain or food web.
Example DDT is a pesticide that eliminates disease-carrying mosquitoes insects and is cheap enough to spray on a whole agricultural field. However the non-biodegradable substance gets into producers which are passed onto those of a higher trophic.
12 Renewable vs Non renewable
Renewable resources can regenerate and are replaceable
Non renewable are not replenished by natural processes
Human activities affect the supply and quality of renewable resources.
13 Ozone Depletion
Ozone depletion is the depletion of the ozone layer.
Caused by compounds called CFCs. They act as catalysts that enable UV light to break apart ozone molecules
The effect of this is that the ozone layer now allows most of the UV rays to reach the earths surface.
14 AIR RESOURCES
Pollutant- A harmful material that can enter the biosphere through the land air or water
Smog- A mixture of chemicals that occurs as a gray-brown haze in the atmosphere.
Acid Rain- Can kill plants by damaging their leaves and changing the chemistry of soils and standing water ecosystems.
15 Threats to Biodiversity
Habitat Alteration/Fragmentation- Occurs when humans destroy an environment or build in it dividing it into smaller pieces. On these small pieces there is less biodiversity due to size as a limiting factor.
Demand for Wildlife products- Humans have used animals and plants in various products for a very long time and arent about to stop now. Over-hunting of animals for their furs meat and other parts has lead to many species becoming extinct.
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