 Nick McCave's research looks at perturbations in the deep oceans, using evidence from micro-fossils combined with carbon dating, to obtain information on pre-historical climate change.It is important to understand the normal cycles of climate change, in order to assess the degree to which the global warming we are experiencing now is caused by man, and the likely consequences by analysis of past analogues.One problem is the interaction between atmospheric climate change and the observed changes in the ocean currents.