This book covers multifaceted problems and their possible solutions in sustainable investing. Written by experts in the field from academia and industry, the book includes three main topics. The general problems of sustainable investing are addressed in Part 1. They include the discussion of the concept of double materiality, current ESG legal framework and its specifics for private equity, the reviews of the sustainable investment indexes and funds, as well as the machine learning techniques for deriving and analysing the ESG ratings.Part 2 is devoted to the climate change. It covers net-zero portfolios being the means of reducing the investment carbon footprint, estimation of the Scope 3 greenhouse gas emissions, venture investments in carbon dioxide removal technologies, and an optimization problem of fuel production in carbon trading.Finally, Part 3 describes several sustainable investing strategies based on including sustainability indices and factors into the portfolio choice framework. It also introduces new portfolio performance measures relevant for sustainable investing.