241803 Most of our cars and machines today are fuelled by conventional, non-renewable fossil fuels such as coal, oil, and gas. These are limited in supply, and they are polluting the environment with greenhouse gases. So we must use more of _______ sources of energy, such as solar, wind, and tidal energies:
241803 Most of our cars and machines today are fuelled by conventional, non-renewable fossil fuels such as coal, oil, and gas. These are limited in supply, and they are polluting the environment with greenhouse gases. So we must use more of _______ sources of energy, such as solar, wind, and tidal energies:
241803 Most of our cars and machines today are fuelled by conventional, non-renewable fossil fuels such as coal, oil, and gas. These are limited in supply, and they are polluting the environment with greenhouse gases. So we must use more of _______ sources of energy, such as solar, wind, and tidal energies:
241803 Most of our cars and machines today are fuelled by conventional, non-renewable fossil fuels such as coal, oil, and gas. These are limited in supply, and they are polluting the environment with greenhouse gases. So we must use more of _______ sources of energy, such as solar, wind, and tidal energies: