This is my own assessment, which is a personal one, and I think I already mentioned it: the lowest hanging fruit is simply energy conservation, that is, making do with less energy. There are many ways in which one can achieve that. We have technologies that we know can reduce fuel use in motor cars and technologies that we know can reduce energy needs of houses, and the like. And these are technologies that are available.
The problem, in my view, is that even if you're convinced of them and you want to install them or buy them, it's not always easy to find out where to get them or to find the technicians and engineers who know how to install them. But more importantly, there are not sufficient incentives, from whatever level of government, to encourage people to actually go out there and buy them and implement them and use them.
So it's not just having the technologies there somewhere. There needs to be what we call an enabling environment that allows for individuals, for companies, and for governments to pick them up and use them.