Alternative energy sources are the future. As people begin to understand the harmful effect of pollution caused by the use of fossil fuels, and the rapid depletion of the Earth’s natural resources, people are turning to energy sources that are both environmentally friendly and easily replenishable. A few of these alternative energy sources includes solar energy, wind energy, bio-gas energy and geothermal energy. Solar energy consists of solar panels that are used to collect sunlight that is converted into electricity. Wind energy is produced by giant turbines that are spun when the wind blows. The turbines transfer the wind energy to a generator which converts it into usable energy. Bio-gas energy is the production of energy through the anaerobic degradation of organic matter, which emits gasses that are used for electricity and as fuel. Geothermal energy, is the capturing of steam found in the Earth’s crust, to power generators that produce electricity. These few different types of renewable energy sources are key factors in man kinds journey to take care of the planet.