This suggests that the subsidence is primarily caused
by ground water extraction for industrial and agricultural use, respectively.
5) As as result of 3 and 4, issues such as subsidence
from ground water extraction, salt water intrusion, water hole and other surface water drying, wild fires, debris flows, etc, etc are rampant.
Regretfully President Obama has highlighted coastal flooding to further politicize climate change, but never mentions the more critical issue
of ground water extraction that desperately needs attention.
For example, studies such as Chao et al., 2008 (Abstract; Google Scholar access) claim human dam building has led to an underestimate of sea level rises due to global warming, while other studies, such as Wada et al., 2010 (Abstract; Google Scholar access) argue that
ground water extraction has led to an overestimate of sea level rises due to global warming.