An interesting review on drought and global aridity changes

Where you read the following:

"The rapid warming since the late 1970s has increased atmospheric demand for moisture and likely altered atmospheric circulation patterns (e.g., over Africa and East Asia), both contributing to the recent drying over land. Since a large part of the recent warming is attributed to human-induced GHG increases,90 it can be concluded that human activities have contributed significantly to the recent drying trend."

You can read this interesting complete review written by Aiguo Dai at:

http://www.cgd.ucar.edu/cas/adai/papers/Dai-drought_WIRES2010.pdf