Human Impact on the Environment

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Presentation transcript:

Human Impact on the Environment For most of history we were hunters & gatherers - 11,000 years ago we began practicing agriculture, farming

Currently: We practice monoculture= big crops. This requires the control and use of dangerous chemicals – Pesticides Industrial growth and urban development= puts a strain on resources and ecosystems. What does that mean for the future? - Food supply is going to be the a population limiting factor. - Ecosystems will not be able to sustain life.

Bioaccumulation When a pollutant is introduced into a food chain and moves up through the trophic levels, becoming the most concentrated in the tertiary (3rd level) consumers Example: DDT(pesticide) was used in farming until we realized it was killing large birds (Eagles, pelicans) because their egg shells were so fragile that no new babies were born!

Acid Rain When nitrogen and sulfur compounds from the burning of fossil fuels mix with water to form acids Can kill plants, dissolve and release toxic chemicals and make water more acidic

Habitat Destruction Destroying habitats of plants and animals. Can be caused by many things- especially human activities. Can lead to a reduced carrying capacity of the environment and eventually extinction.

Deforestation - Destruction or loss of forests - Can cause erosion, loss of nutrients, loss of habitats, decrease in the number of species (biodiversity)

Invasive (non-native) species Species that are introduced to new habitats where they have no natural predators or parasites that control the population growth, so they grow exponentially A dangerous threat to biodiversity Examples: Kudzu in the Southern US, zebra mussels in San Francisco, CA

Climate Change Global Warming: an increase in the average temperature on the planet could cause flooding threats to distribution of species and foods extinction of animals weather pattern changes

Greenhouse Effect: natural situation where heat and radiation is trapped by carbon dioxide, methane, water vapor, and other gases.

Ozone layer depletion Ozone depletion: Ozone layer protects the Earth from UV radiation from the sun. lets more radiation (UV) rays through Causes skin lesions and cancer Caused by CFC’s (Chloroflourocarbons)