The main reservoir for carbon in the environment is the ocean. Oceans hold a vast amount of carbon in the form of dissolved carbon dioxide, carbonates, and living organisms. They play a key role in regulating the Earth’s carbon cycle, absorbing significant amounts of atmospheric carbon and releasing it through biological processes and gas exchange. Terrestrial ecosystems, such as forests and soils, also store carbon but to a lesser extent than oceans. Understanding the ocean's role in carbon storage is crucial for addressing climate change and maintaining ecological balance.