Human resources rated low in aid budgets. Government spending was hit by debt and adjustment. If these trends continue, we could see a world population of 12.5 billion in 2050, possibly rising to 21 billion in 2100. The difference by 2050 would be 4.5 billion - one whole earth of 1980. A difference of 4.5 billion people could determine whether we cross the critical thresholds - or stay on the safe side of them.
Time is of the essence.
Hamlet did not kill Claudius till his hand was forced - and lost his own life as a result of delay. If we wait till our hand is forced, it may be too late. We must act without delay.