Humans and Global Change and Their Effects

The average temperature on Earth has increased by about 1°C in the past 100 years. Which reason best explains this increase in temperature?

• less ozone in the atmosphere

• less nitrogen in the atmosphere

• more of carbon dioxide in the atmosphere

• more oxygen in the atmosphere

Which of the following is the best conclusion that can be made from this graph?

• atmospheric carbon dioxide levels have been decreasing since 1960
• Hawaii has a lot of carbon dioxide
• humans have been working hard to decrease carbon dioxide levels
• atmospheric carbon dioxide levels have increased steadily since 1960

The main human activity that releases greenhouse gases (including carbon dioxide) is

• using bottled water

• burning fossil fuels

• texting on cellphones

• riding bicycles

The _______________ is the average weather conditions in an environment over many years.

• degrees

• temperature

• climate

• weather

Which of the following is contributing to an increase in carbon dioxide in the atmosphere?

• deforestation

• photosynthesis

• oceans

• all of the above

Which is a cause of climate change?

• melting of sea ice

• burning fossil fuels

• severe storms 

• changes in plant life 

Which is an effect of climate change?

• melting of sea ice 
• burning of fossil fuels
• cutting down trees 
• vehicle exhaust

What is deforestation?

• Cutting down MANY trees

• Eating too much vegetables

• Planting trees in the forest

• Cutting down two trees in my yard

The threat to biodiversity that occurs when the homes of different species are destroyed

• pollution

• habitat destruction

• overexploitation

• climate change

When human-made chemicals and garbage find their way into nature and harm the air, soil, and water it is called

• pollution

• habitat destruction

• overexploitation

• climate change