In this paper the climate change effect is an unforeseen earth temperature level above which a negative externality on technology and hence on society’s welfare is exerted. We use a dynamic overlapping generations model to develop a positive analysis of the growth path of an economy with the negative temperature spillover leading to a structural breakdown in capital productivity. Two scenarios for the impact of climate change on intergenerational equity are analyzed: the first is consistent with a state-of-nature framework in which atomistic agents cannot influence the probability that a particular event (productivity collapse) will occur. In the second, according to the maxim “that everybody does what I am doing…«, agents recognize that their choices may influence the probability of productivity collapse occurring in their lifetime.