It refers to the act of buying and selling greenhouse gas emission rights such as carbon dioxide through market mechanism. Simply put, enterprises and countries obtain carbon sinks by reducing their own greenhouse gas emissions, and then sell these carbon sinks to enterprises and countries that need to reduce emissions, thus achieving the purpose of carbon neutrality. This trading method aims to encourage enterprises and individuals to take actions to reduce greenhouse gas emissions, thus slowing down the trend of global warming. Carbon sink trading has become one of the important means for the international community to deal with climate change.