Human Impact on Ecosystems

What is deforestation?

• Clearing Earth's forests on a massive scale
• Eating too much vegetables
• Going to a forest and pulling weeds
• Clearing the five trees in my backyard

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Deforestation is caused by

• agriculture activities
• snakes
• banks
• schools

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Deforestation has an affect on the water cycle

• true
• false

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Deforestation causes an increase in atmospheric carbon dioxide

• true

• false

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what is the leading cause of deforestation?

• Diseases 
• Housing market
• Agriculture and Farming
• Paper mill

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What are the effects of deforestation ?

• loss of habitat
• increased green house gasses 
• soil erosion and flooding
• all of the above

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Does deforestation contribute to global warming?

• No, trees aren't that important
• Sometimes because only the cutting down of Maple trees contributes to global warming
• No, deforestation adds methane to the atmosphere, which makes the Earth cooler
• Yes; less trees means less CO2 is turned into oxygen.

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what are people doing to counter deforestation?

• the US stopped foreign wood products form entering the country.

• they pass laws to protects endangers wild life therefore protecting the forest they live in

• the US created animal shelters for endangered wild life.

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Which of these will reduce deforestation

• Recycle as much paper as possible

• Stop paying third world countries to produce more biofuel crops

• Replant sapling immediately after trees have been cleared

• All the above

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Desertification is: 

• a naturally occurring event due to continual droughts
• both natural and a man made activity caused by lack of precipitation and continual overuse of the land and its resources 
• is man made  but the impact on Earth is very limited
• is permanent and nothing can be done to prevent the causes or effects

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