Which of the following is considered a cultural ecosystem service?

Cultural ecosystem services refer to the non-material benefits that people derive from ecosystems, which contribute to their cultural, aesthetic, and spiritual experiences. Traditional knowledge and practices are an excellent example of cultural ecosystem services because they encompass the skills, values, and customs that communities develop in relation to their environment. These practices are often passed down through generations and can include activities such as hunting, fishing, and sustainable land management, which are deeply connected to a community's identity and way of life.

In contrast, the other options focus on more tangible or direct benefits provided by ecosystems. Clean water supply is a provisioning service, as it refers to the natural resource supplied by aquatic ecosystems. Pollination of crops is typically classified as a regulating service, as it involves the processes that ecosystems perform to maintain their functions and support agricultural productivity. Lastly, decomposing organic matter is related to the nutrient cycling process, which is also a supporting service that enables ecosystem productivity but does not fall under the concept of cultural value. Thus, traditional knowledge and practices uniquely embody the cultural dimension of ecosystem services.