The world is moving into a new era which will be dominated by a new range of threats and a new range of priorities. Already headlines tell of storms and droughts, mass emigrations, the danger of old Soviet nuclear reactors and the thinning ozone layer, and with the menaces of global warming, deforestation, pollution and loss of biodiversity, the picture is likely to get bleaker. Unlike traditional threats, these are not made deliberately and standard military responses are usually in appropriate. They are threats without enemies and they present quite new and fundamental challenges to the...