1. The recent unprecedented rise that we have seen in agricultural commodity prices is showing no signs of letting up.

2. Then the inventions and mass productions of that era gave rise in the 20th century to the information age and the knowledge economy, with an unprecedented rise in innovation and prosperity.

3. With the memory of all the sufferings humans experience an unprecedented rise.

4. U. N. agencies and the World Bank will set up a task force on food to deal with the unprecedented rise in global food prices.

5. UN agencies and the World Bank pledged on Tuesday to set up a task force to tackle an unprecedented rise in global food prices that is threatening to spread social unrest.

6. As a matter of fact, the US government cites "the unprecedented rise" of long-term unemployment to justify this decision.