So first we have transportation. A lot of people think about obviously automobiles, electrification of automobiles would be obviously the new technology that would allow us to start to decarbonizing that that of course is very dependent on the electrical generation sector decarbonizing surprising to many people. That's only about a quarter of all global emissions actually come from energy and electrical generation. So that one is going to need some combination again of renewables plus potentially other sources of zero carbon emitting sources