The onset of more severe ...

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.
 John Beddington

Quotes from the same author

By 2030 the demand for resources will create a crisis with dire consequences. Demand for food and energy will jump 50% by 2030 and for fresh water by 30%, as the population tops 8.3 billion
 John Beddington