这是英国地质调查局的负责人JohnLudden在本周（9月12日）于英国伦敦举行的伦敦地质学会会议上的评论。
John Ludden , executive director of the British Geological Survey ( BGS ), made the comment at the conference of the Geological Society of London in London , United Kingdom , this week ( 12 September ) .
伦敦地质学会