2 . When 62-year-old fisherman Kpana Charlie has finished placing the day’s catch in his nets, he likes to sit on his wooden chair and let his mind go back to his childhood. Back then, his home on Sierra Leone’s Nyangai Island seemed like a paradise (天堂).

He spent endless hours playing with his friends on the island’s shining white beaches. He liked to kick around a soccer ball on the sports field in his village, and in mango season, he would shake the trees to collect their colorful fruit. Whenever he wanted to avoid doing his homework, he could simply disappear into the thick forest that covered much of the island.

Today, Nyangai is disappearing, swallowed up by the sea. As recently as ten years ago, it still measured some 2, 300 feet from end to end. What’s left today is a patch of (一片) sand which is 300 feet long and 250 wide. The forests are gone, flooded by saltwater. The soccer field lies under water for 22 hours of the day. And the land on which Charlie’s family home once stood, the home he was born in, has been disappearing under the waves. In as little as two years, Charlie fears, Nyangai may no longer exist at all.

With nearly a third of its population living in coastal areas, and its heavy reliance on agriculture and fishing, Sierra Leone has been treated as one of the world’s most vulnerable countries to the effects of climate (气候) change.

Gabriel Jaka, head of operations for the country’s Meteorological Agency, says the reason for Nyangai’s troubles is clear. “We’re seeing a significant sea-level rise and these people don’t have any proper defenses,” he says. “All they have are sandbags. If we don’t act now, the effects on people are just going to get worse.”

5 . About 40% of all food grown in the world goes uneaten each year, according to a World Wildlife Fund report from last year. And when food ends up in landfills, it produces huge amounts of greenhouse gases. So it’s no surprise that the app Too Good to Go designed to be opposed to this problem—by giving consumers the opportunity to purchase leftover, out-of-date or ugly food at discount prices—has become increasingly popular in recent years.

Users of the Too Good to Go app can search for local restaurants, bakeries and grocery stores—and purchase surprise bags filled with whatever food is left over at the end of the day. The bags range in price from about $3 to $5, but they’re stocked with food about three times that value. So customers are also getting a steep discount.

Too Good to Go first launched in Europe in 2015 and opened in the US in October 2020.Today it’s available in cities including Austin, Chicago, Los Angeles, Seattle and Philadelphia. And the app saves 300,000 meals a day from ending up in landfills around the world.

Besides saving meals from ending up in the trash, Too Good to Go’s primary aim is to increase awareness of food waste, eventually encouraging consumers to effect policy change in their local communities.

“The whole food chain is wasting food. So we need to help,” said Lucie Basch, co-founder of the app Too Good to Go.” But for us, starting with the consumers and raising awareness with a super simple app that anyone can download and start using today was really the opportunity to make a difference for us.”

8 . Students at the Calhoun School in New York City have much more than a roof over their heads. They have a rooftop garden, with lush grass, colorful flowers and fragrant herbs. “Green roofs” are sprouting up all over, from schools to city skyscrapers. And roofs aren’t the only things going green. Architects are finding all sorts of new ways to build buildings that are easier on the environment. These schools, homes, and offices are called “green buildings”.

Normally it takes a lot of energy to run appliances. Too often, that energy comes from burning fossil fuels. So green buildings are designed to do all these things with much less energy. An energy-smart building starts with thick walls. A layer of insulation (隔热材料) traps air to stop heat from passing through. That keeps heat inside in the winter, and keeps heat outside in the summer. This saves energy for heating and cooling.

Heat pumps are another power-saving way to stay comfortable. A ground heat pump moves heat through pipes that run through the ground next to the building. A few feet under the ground, the temperature stays around 10℃ all year round. Water flowing around the pipes helps heat the building in winter and cool it in summer.

Another way to build green is to use recycled materials. That saves the cost and pollution of manufacturing something new. In the Chicago Center for Green Technology, the ceiling tiles (瓷砖) are made of pressed newspaper. The bathroom floors are tiled with recycled glass, and the stall walls are recycled plastic. Builders have found many creative ways to re-use old materials.

As more people become concerned about climate change, more buildings are going green. Green buildings produce less of the gases that warm the planet. City planners like green buildings because they save money. And they are healthier for the people who work and live inside. But you don’t need to build a whole new building. Simple changes like shading windows and planting trees can make any home greener—and a better Earth home for us all.