This suggests that a climatic shift allowed for their onset.

A relatively small shift of votes, they say, could allow the Communists to enter government.

That shift allowed the backup Wilson to start at corner.

The shift to fancier backpack bags has allowed children to carry much of their world with them.

This shift also allows manufacturers to make more efficient use of the real estate on a hard drive.

As you state, only a "paradigmatic" shift will allow that.

Hopefully a shift to 3DS will allow for a bit more creativity, then.

The shift toward managed care has allowed companies to keep their health care costs down.

Meaning shifts are very common among language users, and allow for great flexibility of word usage.

This shift allowed Schwarzenbach to become the pianist for the band.