Carbon neutrality has become a topic of global consensus. To achieve carbon neutrality, it is also important to enhance carbon sequestration and sink capabilities, apart from the development of new energy to minimize carbon emissions. Carbon sinks can be divided into marine and terrestrial types. The marine carbon sink is mainly composed of three parts: the coastal ecological carbon sink mainly formed by the carbon sequestration effect of coastal vegetation and coastal sediment load, and the marine ecological carbon sink mainly formed by dissolution and microbial pumps in the ocean. Both are directly related to monsoon oceanic current conditions, terrestrial organic inputs, coastal geographical conditions, and human activity. The feasibility of an artificial oceanic carbon sink depends on its impact on marine ecology. In terrestrial carbon sinks, vegetation carbon sinks are formed by organic carbon generated by the photosynthesis of terrestrial plants, including forest, grassland, and wetland vegetation. The influencing factors include temperature and precipitation, atmospheric composition, land use and its changes, and natural disturbance effects. Natural geological carbon sinks mostly consist of soil and karst carbon sinks. Soil carbon sinks are affected by regional vegetation, climatic conditions, soil utilization, and other factors. Karst carbon sinks are mainly produced by weathering between carbonate and silicate rocks absorbing atmospheric CO2, which is affected by temperature, precipitation, rock type, hydrological conditions, and human activity. An artificial geological carbon sink was formed because the captured CO2 was injected into the designated area underground for storage. The storage capacity depends on the evaluation of geological characteristics, reservoir conditions, oil distribution, and production. For the future, it is necessary to act decisively in climatic, natural resources, the social economy, and other aspects to fix carbon, enhance carbon sequestration, and achieve carbon neutrality.