ABSTRACT

As someone who thinks about sustainability, you want to buy the loaf with the best environmental performance. In the shop you pick up two loaves to compare. The packaging of each declares its Water Footprint. One has a footprint of 10 litres. For the other it’s 100 litres. If you want to address your carbon footprint you need to know your numbers. The more CO2 or other greenhouse gas you pump into the atmosphere, the greater will be your contribution to climate change. Water is more complex. Size may not matter so much; context is often more important.