11.   Supplies of food ran sufficiently low to pose a threat as serious as invasion.

12.   Supplies of food were so low that this posed a threat as serious as invasion.

13.   The chemical leak poses a threat to human health.

14.   The chemical pollution poses a threat to the population at large.

15.   The essential need when a proposed redevelopment poses a threat is to rally popular support.

16.   The regime poses a threat to world peace.

17.   This does not mean that the younger members of the underclass pose no threat to public order.