what should the world in future use as a renewable energy source?

Answer 1

This certainly is a good question & above answer is also acceptable; however I think steps should be taken to reduce energy requirement for this cities should be planned accordingly.

Answer 2

The five renewable sources used most often include hydropower (water), solar, wind, geothermal, and biomass.
Sun

Solar energy is energy that comes directly from the sun. The sun is a constant natural source of heat and light, and its radiation can be converted to electricity.

Wind
Natural conditions of climate and geography produce the winds that blow across the landscape. Historically, windmills were used to supply mechanical energy, for example to pump water or grind grain. Modern day wind turbines produce electricity.

Water
Like the winds, flowing water is a product of the earth´s climate and geography. Snowmelt and runoff from precipitation at higher elevations flow toward sea level in streams and rivers. In an earlier era, water wheels used the power of flowing water to turn grinding stones and to run mechanical equipment. Modern hydro-turbines use water power to generate hydroelectricity.

Biomass
"Biomass" describes, in one word, all plants, trees and organic matter on the earth. Biomass is a renewable source of energy because the natural process of photosynthesis constantly produces new organic matter in the growth of trees and plants. Photosynthesis stores the sun´s energy in organic matter. Biomass is used to make heat, electricity and liquid fuels.

Geothermal
Heat from deep within the earth is called "geothermal energy." In some locations, geothermal energy is close enough to the surface that, by drilling a well to reach the heat source, the energy can be extracted and used for heating buildings and other purposes. Where the temperatures are hot enough, geothermal energy can be used to generate electricity

Answer 3

The five renewable sources used most often include hydropower (water), solar, wind, geothermal, and biomass.
Sun

Solar energy is energy that comes directly from the sun. The sun is a constant natural source of heat and light, and its radiation can be converted to electricity.

Wind
Natural conditions of climate and geography produce the winds that blow across the landscape. Historically, windmills were used to supply mechanical energy, for example to pump water or grind grain. Modern day wind turbines produce electricity.

Water
Like the winds, flowing water is a product of the earth´s climate and geography. Snowmelt and runoff from precipitation at higher elevations flow toward sea level in streams and rivers. In an earlier era, water wheels used the power of flowing water to turn grinding stones and to run mechanical equipment. Modern hydro-turbines use water power to generate hydroelectricity.

Biomass
"Biomass" describes, in one word, all plants, trees and organic matter on the earth. Biomass is a renewable source of energy because the natural process of photosynthesis constantly produces new organic matter in the growth of trees and plants. Photosynthesis stores the sun´s energy in organic matter. Biomass is used to make heat, electricity and liquid fuels.

Geothermal
Heat from deep within the earth is called "geothermal energy." In some locations, geothermal energy is close enough to the surface that, by drilling a well to reach the heat source, the energy can be extracted and used for heating buildings and other purposes. Where the temperatures are hot enough, geothermal energy can be used to generate electricity

for detailed info go to http://edugreen.teri.res.in/explore/renew/renew.htm

Answer 4

Solar energy, bio waste can be used as the renewable sources for energy.

Answer 5

The only best and cheep renewable source of energy which can be harnessed by any one is the Solar Energry and Wind Energy.

Answer 6

Because,in about 50 years,petroleum supplies will be exhausted while,in 250 years,coal supplies will be exhausted.Therefore,the world will be forced to use renewable energy.

Answer 7

coal