Ecosystem valuation is an economic process which assigns a value to an ecosystem and/or its ecosystem services. By quantifying, for example, the human welfare benefits of a forest to reduce flooding and erosion while sequestering carbon, providing habitat for endangered species, and absorbing harmful chemicals, such monetization ideally provides a tool for policy-makers and conservationists to evaluate management impacts and compare a cost-benefit analysis of potential policies. However, such valuations are estimates, and involve the inherent quantitative uncertainty and philosophical debate of evaluating a range non-market costs and benefits.
Figure 1. Example of ecosystem services range for mangrove habitat
Natural capital is the world's stock of natural resources, which includes geology, soils, air, water and all living organisms. Some natural capital assets provide people with free goods and services, often called ecosystem services. All of these underpin our economy and society, and thus make human life possible.
Mangrove swamp at Iriomote Island, Japan, providing beneficial services of sediment accumulation, coastal protection, nursery and fish-spawning grounds which may in turn support coastal fishing communities. At least 35% of the world's stock of mangrove swamps has been destroyed in just 20 years
Honeybee (Apis mellifera) pollinating an Avocado crop. Healthy stocks of wild and cultivated pollinator species are important to support the farming industry and help ensure food security.
Aerial view of the Amazon Rainforest. Looked at as a natural capital asset, rainforests provide air and water regulation services, potential sources of new medicines and natural carbon sequestration.
Fires along the Rio Xingu, Brazil – NASA Earth Observatory. Loss of natural capital assets may have significant impact on local and global economies, as well as on the climate.
