Some scientists believe that global warming will lead to an increase in disease and starvation. true

This is true they believe that the increase in heat and the extreme change in temperature will bring back diseases such as the plague and small pox. 

Hope this helps

Yes

Explanation:

As global warming is the warming of the planet the rise in the heat temperature on the lands and waters leads to increased charges on the environment that surrounds us and hence will lead to the spread of various infectious diseases like on the tropical countries have larger scale of viruses and genetic diseases due to the drinking of nuclear or scarce freshwater water. Crisis of hunger, starvation and untimely death all are related to the spread of the unknown diseases in air and the accumulation of toxic wastes in the soils below.

Maybe a horizontal because its a pattern

Answer(a); // soil salinization and waterlogging;