So says Ed Glaeser. He states that because of the temperate climate, more people should live in density in California cities to increase environmental savings. Though this doesn't really work if the people moving here don't have water, the climate changes, and we can't grow food in the central valley.
If this is along the same lines as Randal O'Toole and Wendel Cox are pushing, build in the preserved open spaces at existing densities with limited regulation, then no thank you. However, if its building more density in greyfields and on transit corridors with better transit then sure. But people shouldn't mix the two, that would be a disaster.