Alternative and renewable energy sources are crucial for our future and environmental health. Follow LifeGate and stay up-to-date on the latest energy news. How will the energy demands of billions of people all over the world, including in developing countries and emerging economies, be met? In the past it was sufficient to drill for new oilfields, burn more coal and build new nuclear plants. But today this is no longer possible because these energy sources cause global warming, have economic, social and environmental costs that are too high and, quite simply, are running out. What to do? Renewable energy is collected from natural resources and stored in natural elements including river and ocean water, the wind and sun. Other energy sources include the heat generated by the subsoil, crops, submarine currents, high-altitude winds and sea tides. Renewable resources are inexhaustible, require low-impact plants and generate low levels of CO2 emissions. The development of renewable sources will help reduce dependence on oil, extracted especially in Middle Eastern countries, and avoid generating dangerous waste that is difficult to dispose of.