Add articles to your saved list and come back to them any time. It's all very well for new homes to be sustainably correct. But how do you retrofit an old property? Karin Derkley finds out. It's hard ...

Recycling water is a murky issue. Some say grey water–the wastewater from domestic tasks like washing dishes, doing laundry and bathing–is too good to go down the drain. Grey-haters say it smells, and ...