Which ecosystem is NOT typically considered a carbon sink?

Deserts are not typically considered carbon sinks due to their limited vegetation and arid conditions. A carbon sink is an ecosystem that absorbs more carbon dioxide from the atmosphere than it releases, playing a critical role in reducing the concentration of greenhouse gases.

Wetlands are known for their ability to store carbon in soil and biomass because of their lush plant life and anaerobic conditions, which slow down decomposition. Forests are significant carbon sinks as they absorb large amounts of CO2 through photosynthesis, with trees storing carbon in their wood, leaves, and the surrounding soil. Oceans also act as major carbon sinks by dissolving atmospheric CO2 and supporting marine life that helps sequester carbon.

In contrast, deserts have sparse plant life that results in minimal carbon absorption, and the dry conditions lead to a high rate of decomposition that can release carbon back into the atmosphere. Therefore, since deserts do not contribute significantly to carbon storage, they are not recognized as carbon sinks like the other ecosystems mentioned.