, reported the BBC. In fact, Stockholm is already pretty eco-friendly. Bio-fuel, produced from waste, can... to make a new city-wide heating system. It will use waste heat produced by supermarkets and stadiums ……

, but there are twomain(主要的) groups we can put energy into: renewable and nonrenewable.Renewable energy can be used over... of energy from nonrenewable sources isatomic energy(原子能). Scientists can break apart atoms ofuranium ……

), energy can be called renewable or nonrenewable. Renewable sources are clean and can be used again... its “lifetime”? From picking the cotton to making the material in a factory, the amount of energy ……

or snow, and can be used anywhere from beaches and pools to ski resorts.The body of the camera is finished...FERRARI may be famous for fast and expensive cars, but now you can buy something from the company ……

. Waste that can’t be used is either burned or buried. Water that is used to wash the waste... kinds of waste, such as plastics and unsorted paper. These materials come from countries like the US ……

the BBC. In fact, Stockholm is already pretty eco-friendly. Bio-fuel (生物燃料), produced from waste... to take advantage of a city-wide heating system to use waste heat produced by supermarkets and stadiums ……

TUCHONG TUCHONG  秒懂百科：带你了解机器人的“前世今生”。秒懂百科：带你了解机器人的“前世今生”。Robots are a diverse group.Some walk or roll around while others can take to the skies. Some robots ……

magazine. All the machines on the cotton farm will need oil to run as well. Cotton threads need... the use of energy in all these processes. But we can wash our jeans less once they have been made ……

around the world produced 41.8 million tons of electronic waste (e-waste, 电子垃圾) and only recycled 6...-waste. It can either be valuable (有价值的) or harmful, depending on how we treat it.“E-waste is a valuable ……

requires no additional fuel to run. And it is pollution free. Sunlight can be captured as heat or changed.... WindWind is one of the cleanest forms of energy and can generate power as long as the wind blows ……

small size (6mm by 4mm by 3mm). It can be used to power laptops and mobile phones for months on end... putting 2,000 units into it. But since energy is produced locally in this little engine, it is far more ……

(替代能源) for the country.What is alternative energy?Most of the energy we use nowadays is produced from... of energy. These sources do not harm the air and do not run out. These energy sources are called ……

(替代能源) for the country.What is alternative energy?Most of the energy we use nowadays is produced from... of energy. These sources do not harm the air and do not run out. These energy sources are called ……

to a new fuel, we can now take certain flights without feeling as guilty. A Hainan Airlines flight from Beijing to Chicago, US in November used biological aviation (航空) fuel produced from waste ……

which machines save energy. They may be a little more expensive but they use less power.Make...) makes up for another 15 to 20 percent.1lifetimeAn energy-smart clothes washer can save more water ……