opportunity of change

At length, however, geological events afforded man's nature once more the opportunity of change.

We must be bold enough to seize the opportunity of change, but at the same time prepared for, as one pundit titled his column, 'the protracted conflict.' "

The Administration envisioned "a nation and the global community empowered with the science-based knowledge to manage the risks and opportunities of change in the climate and related environmental systems."

I believe it's a necessary reform, it's a pity that the government have not taken the opportunity of change in the number of seats to bring some measure of proportionality to the British European elections.