Anenvironmental litigation costis afirm-specificrisk that increases uncertainty in a company’s cashflows, thereby raising itscost of capital (discount rate)in a DCF model.Higher discount rates reflect higher risk perceptions, reducing the present value of future earnings.

In contrast, asector-wide carbon tax (B)affects all firms in the industry and is often incorporated into pricing structures, reducing itsfirm-specific impact on discount rates.Launching a sustainable product (A)might lower risk perception, potentially reducing the discount rate instead.