Yes! The British are inspired to use coffee grounds as a new fuel for buses.

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Tencent Science and Technology News according to foreign media reports, green entrepreneur Arthur Kai (Arthur Kay) hopes that London's iconic red bus can be powered by fuel made from coffee residue.

His company, Biobean, collects coffee waste from coffee chains such as Costa and converts it into liquid fuel.

In the coming weeks, the company will launch buses fueled by coffee residue in London.

In London, a dense network of roads and high-rise buildings make the city one of the most polluted cities in Britain. Therefore, it is very important to use clean energy to purify the air.

"We are going through a period of energy diversification. We have shifted from using only fossil fuels to using all kinds of fuels. Biofuel is one of the most important fuels. " Arthur said.

The biochemical method of extracting fuel from coffee grounds is patented. It can extract about 15-20% of the fuel. The rest can be made into biological balls that can be used as fuel in wood-burning stoves.

Arthur said that the supply of coffee grounds is endless. "as long as people are still drinking coffee, there will be coffee grounds." "in Britain, people consume 500000 tons of coffee a year," he said. If we can use all these coffee grounds, we can provide power to whole cities like Manchester. "

Many countries have begun to discover the benefits of biofuels. Biofuels can be extracted from many things such as chocolate and sewage.

A few years ago, the news that Sweden used rabbit carcasses to make fuel made headlines. It chooses rabbits because there are so many rabbits there.

But before that, Sweden had a long history of using biofuels. In Stockholm, the Swedish capital, there are now 15000 cars and 300 buses using biofuels, many of them taxis.

At first, biofuels were made from ethanol. Ethanol, on the other hand, is made from Brazilian sugar cane. However, in the mid-1990s, people worried that this method would not last because sugar cane was also a source of food. As a result, the country began to focus on the use of biofuels-methane produced from municipal sewage.

In order to improve the use of biofuels, Stockholm began to transform urban vehicles and encourage gas stations to add biofuel pumps.

"now, we are exploring new ways to produce biofuels from food waste." Said Gustav Randahl (Gustaf Landahl), director of the smart city project in Stockholm.

This includes providing families with garbage bags of different colors to make it easier for them to classify and store organic waste.

"the air quality in the city is much better now. However, there are still some streets with problems. " He said.

Part of the reason is that diesel cars have become popular in recent years, and the use of non-skid nail tyres, especially in winter, has increased.

In 2009, the European Union decided that 10% of all vehicles in member states should use renewable energy by 2020. However, questions have also been raised about how long such energy can last.

"some biofuels, such as ethanol from corn or rapeseed, may not be sustainable because the raw materials used to make these biofuels are edible. As a result, there is a conflict between using crops to make fuel and providing food. " Explained Dr. Cecilia Cecilia Mondelli, a lecturer at the Advanced School of Catalytic Engineering at the Federal Institute of Technology in Zurich.

Large-scale cultivation of such crops is also a problem because it requires a large area of land to sow.

As a result, more attention is now being paid to extracting biofuels from agricultural wastes such as coffee grounds.

"even if you use agricultural waste, there is no guarantee that its conversion process will not affect the ecological environment. There are many other factors that need to be considered to correctly assess the sustainability of the process, such as the energy and chemical additives it needs and the waste it produces. "

She believes biofuels will be "just an integral part of our future energy system". Other sources of energy include hydrogen, methanol and renewable energy sources such as solar energy.

Some cities have chosen more traditional methods to improve air quality. For example, many cities implement the policy of supporting electric vehicles.

Beijing has announced plans to spend about 9 billion yuan starting this year to convert its 70, 000 taxis into electric cars.

Norway currently claims to have the highest number of electric vehicles per capita in the world. In March, it announced that it had accounted for half of all newly registered vehicles in the country since the beginning of the year. In January, electric vehicles accounted for more than 17% of all new vehicles, while hybrid vehicles accounted for 33.8%.

In Norway, cars with internal combustion engines are heavily taxed. However, electric cars can be exempted from almost all taxes. Owners of electric vehicles can also use toll roads and public parking lots free of charge.

In London, carmaker Ford is working with TfL to try to launch electric vans in the city.

As more and more people begin to rely on online shopping and express delivery services, the number of urban commercial vehicles has increased by 12%.

"as cities continue to develop, this trend will continue." Said Graham Graham Hoare, Ford's chief engineer.

This has forced municipalities to look for more innovative ways to ease traffic jams and improve air quality.

Ford's partnership with TfL will put 20 hybrid vans on the road. The electricity of the hybrid van will be the "most important driving force", while the traditional engine will support the truck to run farther.

Although electric vans are not new, what is special about the project is that Ford will geographically partition London, stipulating where trucks must be driven by pure electricity.

There is a remote monitoring system on the truck to monitor whether the driver is emitting carbon dioxide in the restricted area.

"it's not that we don't trust drivers." "because only by doing so can we ensure that the vehicle runs in certain environments," Hall said. "