Biology B3 4.1 The effects of the population explosion.

What is happening to the human population?

It is increasing rapidly.

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What impact does the increased human population have on the environment?

Humans are using more resources and producing more waste and pollution.

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What is the current world population?

About 7 billion people.

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What are the demands of many people?

A better standard of living.

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What is the impact of the increased population on resources?

We are using up raw materials and those that are non-renewable cannot be replaced.

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What happens when goods are produced for humans?

There is a lot of industrial waste.

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What happens when more waste is produced?

Pollution also increases.

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What impact does an increasing population have on land?

The amount of land available for animals and plants by building, quarrying, farming and dumping waste is decreased.

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What is having a negative impact on the ecology of the Earth?

The continuing increase in the human population.

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How do humans pollute waterways?

With sewage, fertiliser and toxic chemicals.

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How do humans pollute air?

With smoke and gases such as sulfur dioxide, which contributes to acid rain.

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How do humans pollute land?

With toxic chemicals such as pesticides and herbicides and these can then be washed into the water.

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How can some problems arise miles away from the source of the pollution?

Some pollution spreads through the air or water, for example, sulphur dioxide gas can be blown to another area before dissolving in rain.

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Biology B3 4.1 The effects of the population explosion.

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