What should be the response of environmental scientists when the world and the Earth appear to be heading toward exceptional crisis? Some scientists have signed up to public assertions that there indeed could be environmental Armageddon ahead (e.g. Union of Concerned Scientists 1992; US National Academy of Sciences and Royal Society of London 1992). Other scientists proclaim that our most valuable resource is not environmental well-being but professional credibility; the 'cry wolf' risk is the key determinant. Others appear to prefer to be scientists pure and simple, eschewing the policy arena, let alone the political scrum. Still others seem to think that warning of prospective crisis, even warning amongst themselves, is out of protocol's court.