A
Carbon captured by oceans and coastal ecosystems
B
Carbon sequestered in forest biomass and agricultural soils
C
Carbon contained in petroleum and natural gas
D
Carbon present in atmosphere
Correct answer: (a) Carbon captured by oceans and coastal ecosystems
Explanation
- A
Carbon captured by oceans and coastal ecosystems
Carbon stored by oceans and coastal ecosystems. Mangroves, seagrass, salt marsh — blue carbon.
- B
Carbon sequestered in forest biomass and agricultural soils
Forests and soils. That is green / terrestrial carbon.
- C
Carbon contained in petroleum and natural gas
Petroleum and gas. Fossil carbon.
- D
Carbon present in atmosphere
Atmospheric CO2. The stock in air, not ‘blue’.
Summary. Official key is (a). Blue carbon is carbon captured and stored in marine and coastal ecosystems — mangroves, tidal marshes, seagrass beds.