sewage - Waste water and excrement that flows out of toilets and into drains under the street. , fertilise - To make soil more fertile, and help it to grow plants, compromise - To make an agreement that suits two conflicting opinions. Both sides give up some of their rules., efficiency - Use of resources (e.g. energy) that is both cheap and effective. Saves time and saves money., soil - The dirt from which plants grow. , insulation - material used in a house to keep it warm in winter and cool in summer , mud - Wet soil. It can be used to make bricks., grey water - Relatively clean water that comes out of baths, sinks, washing machines, and other kitchen appliances., gopher - A small animal that lives in the desert. It can live underground. , fossil fuels - Natural fuels like coal and gas. They are unsustainable, and not renewable. Different to renewable energy options like solar and hydro power. ,

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