policy windows

The onset of more severe climate impacts overseas may also open up temporary opportunities, or “policy windows .” These would allow legislators the licence to take specific bold actions which they ordinarily believe would not otherwise be possible or politically acceptable… In effect, envisaged solutions can become rapidly translated into practical options for action following a major disaster or near-miss.
Foresight, International Dimensions of Climate Change, 2011, Final Project Report The Government Office for Science, London, p113. Foreword by Sir John Beddington, Head of the UK Government Office of Science.