That was when I decided to use waste materials.
I use waste paper so that I feel free to just scribble away.
One of my favourite things to do is to show people how we can use waste as a resource.
The community lacks access to water and fertiliser so they often use waste water to fertilise crops.
(Australia's scheme has not been used for this purpose, but has mainly financed land use, waste and energy efficiency projects).
And it has made sweeping commitments to the environment, like reducing energy use, waste and carbon emissions.
But while the process of turning corn into ethanol is well established, development of a refinery system that can use waste products is considered less advanced.
But for all this effort, programs to cut water use, waste and carbon footprints have not prevented the continued loss of species.
Øistein Thomassen, a photographer from the city, adds: "We produce insane amounts of waste every day, so why not use waste as fuel for heat?
Such systems can use waste heat, produced as a byproduct of electricity generation or other industrial processes, to warm homes and businesses, replacing on-site boilers.
As Barber points out, all restaurants use "waste": last night's braised meat is tomorrow's ravioli; yesterday's langoustine will soon be bisque.
