22 March: The issue of biodiversity has entered the sphere of finance very recently, precipitating the confrontation of two divergent universes. Such a marriage of the living world and its natural complexity with the area of numbers, money and ‘rational’ economic agent decision is indeed not intuitive. This short paper reviews the different conceptual and theoretical frameworks called upon to apprehend, capture, and integrate biodiversity, and more broadly nature, into the financial system via its various components, with a focus on financial supervisors and monetary authorities. We analyse in particular the challenge of quantifying how biodiversity loss can affect a financial product, portfolio or institution through the use of traditional concepts such as prices and financial risk and examine the main limitations and implications of such approaches.