A simple game formulation is used to examine the possibility of linkin
g generations when a future generation will confront a risk that can b
e alleviated by an earlier generation's investment. An insurance marke
t will function provided that the overlapping generations are sufficie
ntly near in time and share risks. Without propinquity or shared risks
, there is a need for intervention to overcome the problems of missing
markets and missing voters. This intervention should rake the form of
minimum environmental standards, based on a notion of sustainability
that is constitutionally enforced.