Instead of suggesting that people cement over their thirsty lawns, why not promote the use of plants and trees that require little or no watering?
Cement is not the answer. It creates extra heat, therefore people use more air conditioning that creates a need for more energy, which puts additional demands on our limited water supply; whereas plants and trees give off oxygen that this smoggy city sorely needs, they create a cooler and healthier climate and collectively attract more rain . . . all of this, tosay nothing of the aesthetics involved.
Otherwise, it was a very good article and I hope that many more like it will be written teaching people how they can protect or improve our environment.