Such a tired and overused response.  "Do you live in a house made of wood?"  It's like asking if you drive a car that runs on fossil fuels.  We were born into this culture that uses and abuses natural resources with no long term planning.  People build their McMansions, fly in private jets, go golfing in well watered deserts, it's short sighted and stupid. 
We have known for decades that this path is totally unsustainable and the Earth's carrying capacity will max out when we reach 9 billion people; by about 2050.  After that, we will go through the massive die-off which will include humans.   It makes much more sense to build with Hempcrete, repurposed materials, cob construction, tiny homes, apartments, shared housing, etc.  Let's stop behaving as if we have infinite resources and grow up and take some responsibility! A system of Natural Capitalism would be wise, for example; which would include ALL costs in products.