1 . Environmental problems have been recognized as one of the main challenges that we have to overcome in the 21st century. The fact that the environment is getting worse and worse is believed to have become a _________ to our survival. To solve this problem, all the countries in the world should join together _________ working individually for their own interests. 

People support international cooperation for the reason that the _________ of environmental problems is normally on a global scale. It is common sense that we_________ the same biosphere (生物圈), whose components are linked. For example, a stream in one country can be polluted by the dirty water poured by the _________ country. It should be noted that some countries do not have _________ resources to reduce pollution, even though these countries have realized the importance of environmental protection. 

These countries can _________ with the developed countries and obtain technology and experience so as to carry out environmentally friendly policies continuously. 

_________ the importance of international cooperation, countries should take measures to make some changes. It’s fair to say that countries are_________ with different environmental problems. For example, greenhouse gases in China are __________ created by the power generation industry__________ those in the United States are primarily due to the increase in car__________. 

The technologies and methods that are__________ in most countries may not be effective in some countries. In addition, countries should enforce some environmental laws and raise citizens’ __________ of protecting the environment. 

__________, countries should make a joint effort to solve the global environmental problems.

With forests and grasslands burning across the planet, the     1     (important) of forests has come back into the world’s focus. China has become the recognized leader in the greening of degraded (退化的) grasslands    2     deserts, as proved by a number of     3     (award). In December 2019, the United Nations recognized China’s Ant Forest Program as Champions of the Earth.

Ant Forest uses technology    4     (encourage) green behavior in users of China’s popular Alipay platform. Through this APP, customers can collect “green credit” for actions     5     save carbon emission or energy. As soon     6     enough credit is collected, the company will plant a real tree.

China’s efforts have made the country the largest contributor in the global greening area. In 2019, forests     7     (plant) in an area of 70.67 billion square meters. The national forest coverage rate reached 22.96%. China’s example     8     (clear) shows the impact that an alliance ( 联合) of government, company, financing and local communities can have if all pull together to work on a common goal. These     9     (success) cases have been studied for possible emulation ( 仿效) by other countries     10     (affect) by expanding ( 扩张) deserts, such as Pakistan, Sudan or Niger.

9 . You can help protect the planet! Try some of the following tips and get green.

    1     Set out cans and bottles for neighborhood pickup, or exchange them for cash at a recycling ( 回收利用) center. Choose rechargeable batteries ( 充电电池), then recycle them when they die.     2     Sharing books is a great way to reduce waste and reuse materials.

Improve the outdoors. Plant a leafy tree that loses its leaves in fall on the south side of your home. Its shade ( 树荫) will cool your house in the summer.     3     Trees also help clean the air we breathe. They produce oxygen and reduce carbon dioxide.

Don’t litter. Rubbish thrown carelessly outside often washes into rivers, lakes and finally into the oceans.     4    

Cut down on waste. If you have a dripping faucet (滴水的水龙头) in the house, ask your parents to replace the washer inside it. If you stop a faucet from leaking one drop each second, you can save 2, 700 gallons of water a year. Don’t pile (堆满) food onto your plate.     5     Enough food to feed 49 million people ends up in landfills in the United States each year.

10 . In Copenhagen, I travel everywhere by bicycle. Here, cycle lanes are safe, separated from the road. The city’s cycle network is praised by the whole world.

Copenhagen’s city government reported in 2019 that 62% of its citizens are now commuting (通勤) to work or school by bike — an increase from 52% in 2015 and 36% in 2012, when the city started a 14-year plan to improve the quality, safety and comfort of cycling. Those bikers ride about 800, 000 miles a day. According to local reports, there are more bikes (675, 000) than people in Copenhagen, and five times as many bicycles as cars.

The three-hour cycling trip is saving me 1.1 kg of CO2 compared to a bus tour. We arrive at Tivoli Gardens, built in 1843. The world’s second-oldest funfair is doing its bit to protect the environment, with measures including charging visitors extra (向游客额外收费) and providing reusable drinking cups, a move that has saved 10 tons of waste per year. Other parks across the world, I think, may consider following suit.

The next day, I avoid adding a further 2.4 kg to my footprint by experiencing Copenhagen’s canals (运河) by electric GoBoat rather than an engined boat.

“We’re not 100% carbon-neutral (碳中和的) as this would require us to put in more money and we’re a new company,” says GoBoat co-founder Kasper Eich-Romme. “But our boats are usually packed with eight people — the greatest number, while traditional canal tours run CO2-costly boats that could fit 100 - plus people, sometimes with only 5—10 people on board.”

Finding hotels that are reducing carbon use is becoming ever easier, too, especially in Copenhagen, where 70% are eco-certified (生态认证的). Hotel Kong Arthur, a stately building facing Copenhagen’s lakes, is among those leading the charge. It has been carbon-neutral since 2007 and employs simple touches to help guests play their part: there’s no air conditioner — instead, rooms are cooled simply by opening the windows.