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This week's negotiations on conventional forces in Europe will be more complicated than a few years ago, paradoxi-cally because Mr Gorbachev has changed the agenda.
Biologists, and the journals that publish their papers, tend to dismiss theoretical work. Yet it is through ideas, not the mere generation of data, that the course of science is changed.
The CFCs are plainly headed for extinction, but those at this week's London conference should not on that account believe the greenhouse effect has been banished.
