To prognosticate the next big desert bloom is difficult because?

It is near impossible for any individual or technology to be able to prognosticate or predict when the next massive desert bloom will occur, due to the difficulty of being able to directly and certainly understand when the weather patterns will alter to promote crop growth.

Its not wavy i took it so it might be  thick  hope it

The period that marks the paleolithic era is between the 250,000 to 10,000 years.