This course Renewable Energy Sources is intended to introduce students to the whole area of energy sustainability, climate change and renewable energy technologies. Many greenhouse gases, such as carbon dioxide, nitrous oxide, and methane, occur naturally. However, during the past two centuries, human activities have also added significantly to the level of these naturally occurring gases. In particular, large amounts of carbon dioxide, nitrous oxide, and methane are produced by the use of non-renewable energy sources such as oil, natural gas and coal. For a sustainable future these fossil fuels will have to be replaced by renewable energy sources such as wind and solar energy, and biomass fuels.