What do you mean without depleting the forests ?
,you would have to and replace the forest with mono culture tree farming ,these kind of forests are called standing deserts and do not support animal life except some limited insect specie which will become plagues.
they require far more water to irrigate ,because they grow on chemical fertilizer
by the end of the day the soil is contaminated and depleted of anything good.
the ground water supplies will be down,the air will be contaminated
And so It would also strip California of all of its wildlife,animals birds ,everything.
And make it vulnerable to plagues of insects which can then only be combated with chemicals,
There would be changes with the climate ,less rain ,more heat and dry spells.
all of this does not sound good to me
But judging by most of the answers on Yahoo, Most people would not care either way ,so go ahead .
I do not live in California