 Well, I work on the effects of climate change on plants, animals and ecosystems. So we try to understand how changing climates and changing environments in general, how that affects where species are and where they might go to under changing climates. So for instance in Europe at the last Ice Age, the European Oak Tree was really limited to a few small regions at the southern ends of southern Europe. For those species that like it warm, some of those species will do quite well under future climate change. But as we know for instance in Alpine regions high up on mountains, species need the cold. As it warms up and the climate gets warmer and warmer as we move up mountains, those species will really find it hard to find suitable environments. More importantly we want to see as species shift around, we want to see what that means for the whole ecosystem. Because an ecosystem loses some species, some new species come into ecosystems and that will of course change quite majorly how these ecosystems work. For some ecosystems, five species might fulfil the same functional role. So if we lose one of those five, it might not be as bad. We have to decide what we want and that's what we struggle with really. We have to define clearly what it is that we want to save. And that depends on the question and on the money and what it is that we want.