Understanding Earth's Carbon Cycle

What recent trend in atmospheric carbon dioxide levels has been observed?

• A decrease in CO2 levels

• The largest annual increase in 2,000 years

• A slight increase in CO2 levels

• Stable CO2 levels

What is the primary purpose of NASA's Orbiting Carbon Observatory-2 (OCO-2)?

• To study the ozone layer

• To monitor ocean temperatures

• To understand CO2 absorption and emission

• To track weather patterns

During the 2015-2016 El Niño event, which regions were identified as major contributors to increased atmospheric CO2?

• The Arctic, the Sahara, and the Amazon

• Australia, Antarctica, and Greenland

• South America, Africa, and Indonesia

• North America, Europe, and Asia

What factors contributed to the increased carbon emissions from certain regions during the El Niño event?

• Higher humidity and stronger winds

• More snowfall and cooler summers

• Increased temperatures, less rain, or more fires

• Decreased temperatures and more rain

What question does Dr. Annmarie Eldering raise about the future of CO2 absorption by natural processes?

• Will CO2 absorption become irrelevant?

• Will the land and ocean continue absorbing CO2?

• Will CO2 levels decrease naturally?

• Will natural processes stop absorbing CO2?