Christian Gollier’s The Economics of Risk and Time and Pricing the Planet’s Future: The Economics of Discounting in an Uncertain Future are excellent books on discounting, uncertainty, and the interactions between the two. Paul Portney and John Weyant’s Discounting and Intergenerational Equity is a fine collection on discounting. Ferenc Toth’s Fair Weather: Equity Concerns in Climate Change is one of the best treatises on equity and climate policy.
IDEAS/RePEc has a curated bibliography on this topic.