Google 🙂

Energy cost of pumping water to SoCal:

http://www.eesi.org/briefings/2006/Energy&Climate/9.13.06-Energy-Water-Climate/Gleick_9.13.06.pdf

Energy to CO2 conversion factors are easy to find – e.g. here

ftp://ftp.eia.doe.gov/pub/oiaf/1605/cdrom/pdf/e-supdoc.pdf

0.61 lbs (275 g) of CO2 per kWh of electricity (California, 2000)

Carbon consumption of the lawn is the hardest one. Many places say that it takes 625 sf of grass to capture all carbon dioxide exhaled by one person (roughly 1 kg / day).