1 * Fill in: air, oil, rain, energy, carbon, fuels, crops. 1 You can reduce your footprint by using renewable energy. 2 Coal and oil are examples of fossil .. 3 Growing requires land so some animals lose their natural habitat. 4 There are many different ideas about what the next renewable ........ ....... source will be. 5 Vehicles contribute to acid ...... as they release pollutants into the air. 6 Major cities have a real problem with ...... pollution 7 Biofuels can even be made with vegetable​