Originally Posted by ecarlson972
1: Will it reduce our air quality in the citys not having C02 breathing plants?
2: I would imagine that rock holds more heat than grass which would increase global warming!
3: Supplying more rock to everyone would destruct more land!
Just a few questions. Like I said I dont know anything about this so maybe you will change my mind.
Xeriscaping means using plants and other landscaping that dosen't require supplemental irrigation. So you can have lots of plants - they just have to be able to survive with rain water in our climate. Rocks don't require water so they qualify - but xeriscaping dosen't require rocks. Many people also include drip-irrigation as part of xeriscaping which opens up more possibilities for plants.
It is true that rocks hold heat longer than say grass - and that means that their release of heat occurs over a longer period of time, but i don't think that results in a net gain in heat absorbed by the earth vs reflected back into space. The color of the rocks would be key in determining this. Light colored rock is going to reflect much of the heat back without absorption.
Finally, you are right suppling more mined rock causes more environmental degradation. But you would also have to answer the question - which is more environmentally costly: growing, mowing and fertilizing grass or mining rock and then having it sit in your yard. I suspect in the long run the rock is more environmentally friendly than the emissions associated with building and shipping your lawn mower, your running it (lawn mowers are generally high pollution devices), and the production and application of fertilizer. But that is pure speculation on my part.