Did Alexander Cause Climate Change?

Currently I am reading Alexander, by Theodore Ayrault Dodge. I definately recommend it to anyone who is interested in the finer details of Alexander the Great and his campaigns. Dodge is best known for his book on Hannibal, which remains the authority on the brialliant Carthaginian.

Dodge pays a lot of attention to detail in his writings, especially to topography, weather, etc... In Alexander, Dodge constantly refers to how the climate has changed from 330 BC to late 19th century (the book was published in 1890) including references to locations now partially submerged or landscapes that have changed. Here is a typical example in Dodge's discussion of the Battle of Hydaaspes in 326:

The rainy season had just set in. Today it is said to begin in July. Unless the ancient chronology is at fault, it began earlier two thousand years ago.

Now, Alexander viewed himself to be the son of a God. Could it be that Alexander himself caused climate change? Perhaps his ego partially clouded out the sun. Or maybe major climate change occurs natuarally.