air pollution - harmful substances in the air, often consisting of waste from vehicles or industry, drought - a long period when there is little or no rain, environmentally friendly - not harmful to the environment, landfill - the process of getting rid of large amounts of rubbish by burying it, or a place where rubbish is buried, toxic chemicals - dangerous properties of toxic substances, biodegradable - able to decay naturally, energy-saving  - relating to products, systems, etc. that use as little electricity, gas, etc, global warming - causes climate change, which poses a serious threat to life on Earth, natural resources - things such as minerals, forests, coal, etc. that exist in a place and can be used by people:, water consumption - he total amount of water that is used is called the gross water use,

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