Which of these is the longest-lasting sink for CO₂?
A) plant tissues and cellulose (the "woody" parts of plants)
B) the atmosphere
C) air bubbles within glacial ice
D) limestones and oil and gas deposits

Question

Quizplus · Accepted Answer

Limestones and oil and gas deposits are the longest-lasting sinks for CO₂, as they can hold on to carbon for millions of years. Plant tissues and cellulose, as well as the atmosphere, only hold on to carbon for much shorter periods of time. Air bubbles within glacial ice can also hold onto carbon for potentially thousands of years, but not as long as limestones and oil and gas deposits.

Which of These Is the Longest-Lasting Sink for CO₂