Today's generation is more aware of the urgent need to be environmentally friendly - in colloquial terms to 'go green'. There has been an increasing use of renewable energy sources worldwide, like hydroelectricity, solar power and wind turbines. Green energy is energy that is produced in a clean and efficient manner that has less of a negative impact to the environment than energy sources like fossil fuels. One of the goals of green energy is to reduce greenhouse gas emissions.
Sources for green energy are such as the Sun (solar energy), wind (wind power), rivers (hydroelectric power), hot springs (geothermal energy), tides (tidal power), and biomass (biofuels). There are several more, even including nuclear energy, that is sometimes considered a green energy source because of its lower waste output relative to energy sources such as coal or oil.
Fossil fuel combustion has a number of negative environmental consequences. Fossil-fuelled power plants emit air pollutants such as sulfur dioxide, particle matter, nitrogen oxides, and toxic chemicals. Mobile sources, such as fossil-fuelled vehicles, emit nitrogen oxides, carbon monoxide, and particulate matter. Exposure to these pollutants can cause heart disease, asthma, and other human health problems. Furthermore, the burning of fossil fuels releases carbon dioxide (CO2), one of the main greenhouse gases that cause global warming.
At the beginning of the 21st century, about 80% of the world's energy was derived from fossil fuels such as goal, petroleum, and natural gas Fossil fuels are finite resources, meaning that one day it will run out. Green energy on the other hand is renewable and come form replenish-able sources.