Nowadays, most computers you can get in the UK are energy efficient. Many manufacturers will state this on the outside of the computer. A known energy efficiency classification company is Energy Star.
According to the experts this web site is bogo.
The diesel is more efficient but more expensive to build.
The upfront cost is higher and harder to swallow, however in the long run, energy efficient appliances can save you money. They use less energy each time they are used, so your monthly bills will be lower.
Heating with electricity is generally less efficient and more expensive compared to other heating methods, such as natural gas or propane. This is because electricity is often more expensive and less energy-efficient than other fuel sources.
Gas ovens are generally more efficient with energy consumption.
To read more about energy efficient air conditioners, go to wikipedia and look up Energy star. This will give you information on how and why a unit will be more energy efficient and "green".
I would assume it means that the more efficient it is, the less energy it intakes and the more efficient the system is at retaining the energy it intakes.
Yes, geothermal energy is more expensive than hydro power
Yes, double paned windows will keep out the cold and keep in the heat. In the summer, they will keep in the cold and keep the heat out. These are more expensive than normal windows but worth it with the energy savings.
It is only a little more energy efficient than creating new plastic. Aluminum recycling, though, is 90% more energy efficient than making new aluminum for bauxite.
Solar power is a highly efficient form of renewable energy. Solar panels can convert sunlight into electricity with an average efficiency of around 15-20%, with more advanced panels reaching up to 22-24%. Additionally, solar energy systems have minimal maintenance requirements and can produce electricity for 25 years or more.
Leaving lights on when not in use does not make a home more energy efficient as it unnecessarily consumes electricity.