A full participation agreement on global emission reduction through strategic investments in R & D.

If an emission reduction agreement with participation of all players is not enforceable because politicians are too myopic or not able to commit themselves to sustainable policies or costs of reducing emis- sions are too high, strategic investments in research and development (R&D) of green technology, for example sustainable drive-trains, can pave the way for a future treaty. Although no player will rationally reduce emissions on its own, investments in R&D by at least one player can change the strategic situation of negotiations to control emissions: Emission abatement costs will decrease so that a treaty with full par- ticipation can be achieved in future periods through time consistent sustainable policies.