The acidification of oceans is increasing. Why is this phenomenon a cause of concern?

1. The growth and survival of calcareous phytoplankton will be adversely affected.

2. The growth and survival of coral reefs will be adversely affected.

3. The survival of some animals that have phytoplankton larvae will be adversely     affected.

4. The cloud seeding and formation of clouds will be adversely affected.

Which of the statement(s) given above is/are correct?

I.A.S. (Pre) 2012