admin answers:

Energy efficiency and renewable energy are said to be the twin pillars of sustainable energy. Some ways in which sustainable energy has been defined are:
“Effectively, the provision of energy such that it meets the needs of the present without compromising the ability of future generations to meet their own needs. …Sustainable Energy has two key components: renewable energy and energy efficiency.” – Renewable Energy and Efficiency Partnership (British)
“Dynamic harmony between equitable availability of energy-intensive goods and services to all people and the preservation of the earth for future generations.” And, “the solution will lie in finding sustainable energy sources and more efficient means of converting and utilizing energy.”

“Any energy generation, efficiency & conservation source where: Resources are available to enable massive scaling to become a significant portion of energy generation, long term, preferably 100 years..” – Invest, a green technology non-profit organization.
“Energy which is replenishable within a human lifetime and causes no long-term damage to the environment.”

admin answers:

… This may help:

Solutions to Global Warming

Reducing your family’s heat-trapping emissions does not mean forgoing modern conveniences; it means making smart choices and using energy-efficient products, which may require an additional investment up front, but often pay you back in energy savings within a couple of years.
1.The car you drive: the most important personal climate decision.
When you buy your next car, look for the one with the best fuel economy in its class. Each gallon of gas you use is responsible for 25 pounds of heat-trapping gases in the atmosphere. Better gas mileage not only reduces global warming, but will also save you thousands of dollars at the pump over the life of the vehicle. Compare the fuel economy of the cars you’re considering and look for new technologies like hybrid engines.
2.Choose clean power. More than half the electricity in the United States comes from polluting coal-fired power plants. And power plants are the single largest source of heat-trapping gas. None of us can live without electricity, but in some states, you can switch to electricity companies that provide 50 to 100 percent renewable energy
3.Look for Energy Star. When it comes time to replace appliances, look for the Energy Star label on new appliances (refrigerators, freezers, furnaces, air conditioners, and water heaters use the most energy). These items may cost a bit more initially, but the energy savings will pay back the extra investment within a couple of years. Household energy savings really can make a difference: If each household in the United States replaced its existing appliances with the most efficient models available, we would save $15 billion in energy costs and eliminate 175 million tons of heat-trapping gases.
4.Unplug a freezer.
One of the quickest ways to reduce your global warming impact is to unplug the extra refrigerator or freezer you rarely use (except when you need it for holidays and parties). This can reduce the typical family’s carbon dioxide emissions by nearly 10 percent.
5.Get a home energy audit.
Take advantage of the free home energy audits offered by many utilities. Simple measures, such as installing a programmable thermostat to replace your old dial unit or sealing and insulating heating and cooling ducts, can each reduce a typical family’s carbon dioxide emissions by about 5 percent.
6.Light bulbs matter.
If every household in the United States replaced one regular light bulb with an energy-saving model, we could reduce global warming pollution by more than 90 billion pounds over the life of the bulbs; the same as taking 6.3 million cars off the road. So, replace your incandescent bulbs with more efficient compact fluorescents, which now come in all shapes and sizes. You’ll be doing your share to cut back on heat-trapping pollution and you’ll save money on your electric bills and light bulbs.
7.Think before you drive.
If you own more than one vehicle, use the less fuel-efficient one only when you can fill it with passengers. Driving a full minivan may be kinder to the environment than two midsize cars. Whenever possible, join a carpool or take mass transit.
8.Buy good wood.
When buying wood products, check for labels that indicate the source of the timber. Supporting forests that are managed in a sustainable fashion makes sense for biodiversity, and it may make sense for the climate too. Forests that are well managed are more likely to store carbon effectively because more trees are left standing and carbon-storing soils are less disturbed.
9.Plant a tree.
You can also make a difference in your own backyard. Get a group in your neighborhood together and contact your local arborist or urban forester about planting trees on private property and public land. In addition to storing carbon, trees planted in and around urban areas and residences can provide much-needed shade in the summer, reducing energy bills and fossil fuel use.
Naturally Occurring Warming
Volcanic Eruptions
Large volcanic eruptions can throw so much dust into the sky that the dust acts as a shield to solar radiation and causes a cooling trend in the atmosphere. You probably can’t remember such an eruption as they are rare and infrequent occurances.
Sunspots
Changes in the Earth’s solar radiation levels can have some impact on the Earth’s climate. Increased solar activity can cause short-term warming cycles on the Earth.
The Wobbly Earth
As the Earth spins, it does not achieve perfect rotation. It actually wobbles slightly, thus alternately exposing the northern and southern latitudes to more and less solar radiation. This wobble in the Earth’s rotation has been causing changes in the temperature of the atmosphere for many millions of years.