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• 1 Humans and the environment

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• For what kind of things does the environment serve for humans??

  - as our source of food
  - we take oxygen from the air
  - provides our water supply
  - take energy from environment
  - natural resources
  - used for recreation

• How does the environment serve for food?

  - plants produce food by process of photosynthesis, animals feed on these plants
  - we feed on matrials derived from plants and animals
  - major part of our food comes from agriculture

• How does the environment serve for oxygen?

  Oxygen is produced during photosynthesis. Plants release oxygen into the air. We require oxygen for respiration in our body.

• For what do we use the energy taken from the environment?

  This energy is used to heat homes and do prepare our food. Also for machines and to transport our products and ourselves.

• How does the enviroment serve for natural resources

  we take them from environment. This are raw materials used for many products. Iron ore is used for steal. Plastic and other sunteti materials are obtained from crude oil. Wool from sheep is used to produce clothes.

• How is the enviroment used as recreation?

  Humans use the environment to relax. People like to spend their free time in nature; waling, fishing, sunbathing or sailing. A lot of people enjoy the beauty of nature.

• What do the human activities pose in the modern times?

  serìous environmental problems

• By what are environmental problems caused?

  - by the discharge of materials that result in pollution 
  - by taking so many materials from the Earth that depletion will be the result.  
  - pollution and depletion damage the environment

• What are the two main causes of these problems?

  the growth of human populatioon and people's lifestyle.

• What does an increasing human population bring?

  greater demands on resoures. As more food  needed, more land is cleared for agriculture. But people also need places to live and roads for transport.