In the present crisis, though, that critical threshold has not yet been reached.

The critical threshold is reached only in the winter.

When a tipping point, the critical threshold, is reached a small change in human activity can have long-term consequences on the environment.

Should an American intelligence agency cross that critical threshold?

Thus, a reference to the theory of the critical threshold can be drawn.

It's an example where a critical threshold has been passed.

At the beginning of the twentieth century the population of Others fell to a critical threshold.

Obviously, somebody did catch on before I passed the critical threshold.

There will always be subtle differences, but the universe adjusts to them, short of a critical threshold.

In the Commission proposal, the age of 68 is the critical threshold.