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Bit of a hard read ahead from William Cotton and Roger Pielke in Human Impacts on Weather and Climate (Cambridge University press, £45/$64.95 hbk, £16.95/$24.95 pbk, ISBN 0 521 49929 1) but if you want to make sense of models for climate change, they will lead you through the maze of ZAMs, EBMs and RCMs (that’s your zonally-averaged, energy balance and radiative-convective models). Given the debate about what impact human activities have an the climate, it is useful to know where to find the keys to the debate.