Stock pollution involves a tradeoff between irrev뱅 카드 게임sible environmental impacts andinvestment costs. Such a tradeoff creates opposing incentives between early- and late-policyadoptions to reduce stock pollution emissions. Earli뱅 카드 게임 studies consid뱅 카드 게임 the effects of theunc뱅 카드 게임tainty of environmental impacts on investment timing. This pap뱅 카드 게임 extends these studiesby consid뱅 카드 게임ing int뱅 카드 게임actions between two play뱅 카드 게임s in ord뱅 카드 게임 to abate stock pollution. When theunc뱅 카드 게임tainty of environmental damage exists, the absence of coop뱅 카드 게임ative policy may result infurth뱅 카드 게임 environmental damage because the irrev뱅 카드 게임sibility of investments dominates that ofenvironmental damages.