tol and fankhauser reviewed the modelling of impacts in iams that participated in the stanford energy modeling forum discussing the level of spatial detail the damage categories considered the impact metrics the climatic and nonclimatic drivers of impacts the functional specification and benchmarks of monetized damage functions the feedback of impacts on other model variables and the representation of adaptation yohe briefly reviewed the representation of impacts in iams including most of the models considered by tol and fankhauser stanton ackerman and kartha review climateeconomy models focusing on the treatment of four critical issues