Human Impact on the Environment Quiz

How many species are currently threatened with extinction?

• 500,000

• 1,000,000

• 2,000,000

• 5,000,000

What percentage of the land-based environment has been significantly altered by human actions?

• 50%

• 60%

• 75%

• 80%

Since 1970, by how much has the value of agricultural crop production increased?

• 100%

• 200%

• 300%

• 400%

By what percentage has tree cutting increased since 1970?

• 25%

• 35%

• 45%

• 55%

How many billion tons of resources are extracted globally every year?

• 30 billion tons

• 45 billion tons

• 60 billion tons

• 75 billion tons

What percentage of the global land surface has had its productivity reduced due to land degradation?

• 15%

• 23%

• 30%

• 40%

How much in annual global crops is at risk from pollinator loss?

• US$377 billion

• US$477 billion

• US$577 billion

• US$677 billion

How many people are at increased risk of floods and hurricanes due to loss of coastal habitats?

• 50-150 million

• 100-300 million

• 200-400 million

• 300-500 million

In 2015, what percentage of marine fish stocks were being harvested at unsustainable levels?

• 23%

• 33%

• 43%

• 53%

By how much have urban areas increased since 1992?

• They have doubled

• They have tripled

• They have quadrupled

• They have remained the same