1. Global warming and other ecological problems have caused the use of 100% renewable energy. Renewable energy use has grown much faster than anyone expected.
2. Renewable energy is energy from natural resources—such as sunlight, wind, rain, tides and geothermal heat.
3. Renewable energy technologies come from solar power, wind power, hydroelectricity, biomass and biofuels for transportation.
4. Spain produces one-third of their electricity from solar photovoltaic panels. Norway and some other countries already get all of their electricity from renewable sources.
5. Wind power turbines are spreading over all continents. Wind turbines generate nearly 30% of Danish electricity. Portugal produces more than half their electricity from renewable energy resources.

1. Fresh water is water that does not have a lot of salt in it. When people say fresh water, they are most likely talking about water from lakes, rivers, snow, or ice. It can also mean water that people drink. Although to drink the water from the snow that is completely frozen without melting it first, can be very dangerous for you.
2. The oceans and the seas are made up of salt water, which people cannot drink. However, people cannot drink all fresh water too, since it might not be clean or might have bacteria in it. Fresh water that people can safely drink is called potable water.
3. Water pollution is the pollution of bodies of water, such as lakes, rivers, the oceans, as well as groundwater. It occurs when pollutants reach these bodies of water without treatment.
4. Water pollution is a problem for the species and ecosystems. It affects plants and organisms living in the water. In almost all cases the effect is damaging not only to individual species and populations, but also to the wider biological communities.
5. Water scarcity is a lack of drinkable water available in a given area. It mostly affects arid deserted areas, and places where the water is too polluted to drink. It is a social, environmental and economic problem in many countries. Water scarcity can be the result of both human and natural causes. Changes in climate and weather patterns can cause the availability of water to drop. Common human causes include over-consumption, bad governance, pollution, and increase in the demand for water.
6. A water shortage is when there is not enough water to meet demand. It is normally brought on by changes in the weather, such as drought. Water scarcity has negative effects on ecology, biodiversity, agriculture and human health. It has also led to armed conflicts in several cases.