As the human population increases they require more homes to live in.  These people also require clothes, food, cars, furniture, jobs – this all means more industry.  The effect of all this is the need for more land and that means less habitats for wildlife.
 
As the human population increases we enter a complex network of events:
 

Despite the growing human population some areas have remained green; these include farms, parks, golf courses and airfields.  These areas are the habitats for our wildlife.

In a habitat such as a hedge live a number of different organisms -Producers, consumers and decomposers, these organisms make up a community.

Food chains and webs connect these organisms to each other; consumers eat producers and other consumers, decomposers live on dead producers and consumers.   A food chain:
A food Web:

The organisms in a community are affected by environmental factors such as temperature and rainfall.  Man’s activities also affect the wildlife - pesticides, weed-killers, cultivating of land, cutting hedges and fertilisers all affect wildlife.

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