Biodiversity credits and offsets (THINK NATURE CONCEPT DOCUMENT #5)

Executive summary. Ecological damage caused by infrastructure projects or other activity can be compensated by the application of nature-friendly actions in a process called biodiversity offsetting. The typical goal of offsetting is no-net-loss, which means that ecological net losses must be fully compensated by commensurate net gains. Estimation of net loss should account for the size of area impacted, its ecological condition and the degree of impact expected. Losses from both outright habitat conversion and increased disturbance should be accounted for. To implement the offsets, one can use common types of nature-friendly actions: protection, habitat restoration, and habitat maintenance. Net positive impact can be achieved if offsets are larger than what would be needed for no-net-loss. There are fifteen or so design factors that influence the credibility, feasibility, and costs of offsetting. These factors can be grouped under aims, decisions about the spatial aspects and timing of offsets, measurement of biodiversity, and the properties of offsets actions. One critical design component is the response of biodiversity to the offset actions taken, which can be summarized and quantified by a time-response function. The response function is introduced here, because it is also relevant for the evaluation of biodiversity credits. As part of the mitigation hierarchy, offsets are closely related to impact avoidance and minimization, which can be implemented via nature-friendly spatial design and technical impact avoidance measures. Impact avoidance, offsets, habitat banking, biodiversity credits and payments for ecosystem services are all themes that can cross paths with business interests. In some cases, operational permits may require the implementation of offsets. Overall, the theme of impact avoidance is very important for the interaction between nature and people. While there is broad global interest in both biodiversity offsets and credits, there are also concerns about risks. The causes of offset failure include systemic failure of offset policy, incompetent project-level design, poor enforcement of implementation, and failure of monitoring, verification, and accounting. Such concerns should be addressed with competent and transparent design and implementation. This document is #5 in Think Nature’s series of concept notes provided as a public service for those interested in understanding the interaction of people and biodiversity. Overall offsetting and biodiversity credits are a broad topic and the present text is only a brief introduction. ©︎ 2025 Think Nature Inc.