Final answer:
A worldwide drop in rain volumes is NOT a projected effect of climate change; rather, the intensity of rainfall events is predicted to increase in many areas.
Step-by-step explanation:
The projected effects of climate change include a wide range of environmental, societal, and economic impacts. Among these, an increase in global average air and ocean temperatures, a rise in sea levels, the spread of diseases carried by insects such as malaria, more extreme weather events, and the increased intensity of precipitation events on average are all well-documented consequences. Therefore, the answer to the question is that a worldwide drop in rain volumes is NOT among the projected effects of climate change. In fact, while some regions may experience less rainfall, overall, the intensity of rainfall events is predicted to increase in many areas.