How humans disruputed a cycle essential to life

What substance do plants absorb from the atmosphere and convert into oxygen and sugar using energy from the sun?

• Nitrogen

• Carbon dioxide

• Water vapor

• Methane

Over millions of years, what can dead organic matter, subjected to extreme heat and pressure underground, transform into?

• Water

• Fossil fuels

• Sand

• Pure oxygen

What human activity has significantly disrupted the natural carbon cycle by rapidly increasing atmospheric carbon?

• Planting large numbers of trees

• Developing new agricultural techniques

• Extracting and burning fossil fuels

• Building dams for hydroelectric power

Which of these methods was NOT mentioned as a way to remove carbon from the atmosphere?

• Restoring forests

• Holistic grazing

• Direct carbon capture machines

• Switching to renewable energy sources

Compare the rates of carbon emission through geologic processes, like vulcanism and weathering, to carbon emission through anthropogenic activities, such as burning fossil fuels.