1. 3 Mention procreation, and they talk about the population explosion.

2. 12 The world is facing a problem of population explosion.

3. 29 The world is facing a problem of population explosion.

4. Periodically, however, the Budworm undergoes a population explosion (epidemic) and becomes so abundant that serious feeding damage occurs.

5. These usually limit Budworm numbers, but from time to time, a combination of factors can produce a population explosion, resulting in extensive damage