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Humans on earth= 100 and 50 thousand years
Age of planet= 4 and a half billion years!!!
Even though we lived on earth for a short period of time, we have made a huge effect on the earth's resources and organisms in many way.
Humans effect ecosystem in three ways:
1. Pollutions
2. Conservation
3. Waste Management
Today we are going to learn all about the pollution!
Pollution is any harmful addition to the environment
Domestic Pollution: Including household wastes
Adricultural Pollution: Including use of sprays to contols weeds, the overuse of fertilisers and disposal of farmyard wastes such as slurry
Industrial Pollution: Incuding smoke that causes acid rain and wastes that may damage streams, rivers and lakes
Effects of Ozone Depletion
Increasing ultraviolet levels have a number of effects such as:
1. A reduction in the use of CFCs (chlorofluorocarbons) = allowing ozone layer to be replenished. Ozone layer is formeed naturally by the rection of ultraviolet light and oxyen
CFCs are replaced by hydrofluorocarbons (HFCs). These chemicals break down much faster than CFCs - Therefore they don't reach the upper atmosphere- and don't cause ozone to break down.
2. Do not use sprays or foam products that contain CFCs
3. Fridges should not be dumped in landfill sites.
They should be returned to organisations that will dipose of their CFCs in an environmentally friendly way