Human Impacts on Ecosystems

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Why do farmers use fertilisers?
To give plants nutrients and to help them grow
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How does this unbalance ecosystems?
The input of nutrients is much higher than normal
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Humans take biomass out of ecosystems for their own use - how can this damage an ecosystem?
Over fishing removes a food source for some of the organisms in a food chain. Also, unsustainable timber harvesting removes habitats and food sources
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Humans can often clear natural areas of vegetation in ecosystems so they can grow agricultural crops and raise livestock. How does this cause major problems?
They can reduce the biodiversity of an ecosystem. They can increase soil erosion.
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Humans create non-recyclable waste, that can't be used again within a system. What does this do?
The waste can build to harmful levels in an ecosystem
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What is an example of human systems?
Households, Agriculture and Industry
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Human systems aren't closed systems. Why is this?
Human systems create non-recyclable waste
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Other cards in this set

Card 2

Front

How does this unbalance ecosystems?

Back

The input of nutrients is much higher than normal

Card 3

Front

Humans take biomass out of ecosystems for their own use - how can this damage an ecosystem?

Back

Preview of the front of card 3

Card 4

Front

Humans can often clear natural areas of vegetation in ecosystems so they can grow agricultural crops and raise livestock. How does this cause major problems?

Back

Preview of the front of card 4

Card 5

Front

Humans create non-recyclable waste, that can't be used again within a system. What does this do?

Back

Preview of the front of card 5
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