Your group letter is on your desk 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 slide Either type or write I will help with this part

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.

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.

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.

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.

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.

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. Effect: Environmental change Polar ice caps will melt Rise of sea levels Weather disturbances.

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 Earth’s oceans are particularly valuable for the food resources they contain.

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.

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.

Ozone Depletion Ozone depletion is the depletion of the ozone layer. Caused by compounds called CFC’s. 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 earth’s surface.

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.

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 aren’t about to stop now. Over-hunting of animals for their furs, meat and other parts has lead to many species becoming extinct.