1 . The San Diego County Water Authority has an unusual plan to use the city’s scenic San Vicente Reservoir (水库) to store solar power so it’s available after sunset. The project could help unlock America’s clean energy future.

Perhaps ten years from now, if all goes smoothly, large underground pipes will connect this lake to a new reservoir, a much smaller one, built in a nearby valley about 1100 feet higher. When the sun is high in the sky, California’s abundant solar power will pump water into that upper reservoir. It’s a way to store the electricity. When the sun goes down and solar power disappears, operators would open a valve (阀门) and the force of 8 million tons of water, falling back downhill through those same pipes, would drive machines capable of producing 500 megawatts of electricity for up to eight hours. That’s enough to power 130, 000 typical homes.

“It’s a water battery!” says Neena Kuzmich, Deputy Director of Engineering for the water authority. She says energy storage facilities like these will be increasingly important as California starts to rely more on energy from wind and solar, which produce electricity on their own schedules, without considering the demands of consumers.

Californians learned this during a heat wave this past summer. “Everybody in the state of California got a text message at 5:30 in the evening to turn off their appliances,” Kuzmich says. The sun was going down, solar generation was disappearing, and the remaining power plants, many of them burning gas, couldn’t keep up with demand. The reminder worked:People stopped using so much power, and the grid (电网) survived.

Yet earlier on that same day, there was so much solar power available that the grid couldn’t take it all. Grid operators turned away more than 2000 megawatt hours of electricity that solar generators could have delivered, enough to power a small city. That electricity was wasted. There was no way to store it for later, when operators desperately needed it.

2 . A worldwide shift from fossil fuel-powered cars to electric vehicles could significantly reduce the amount of carbon dioxide that humans emit to the atmosphere. But current strategies for vehicle electrification (电气化) can also shift some pollution to communities already suffering under higher economic, health and environmental burdens, researchers warn.

California, which leads the United States by a mile when it comes to EV adoption, offers a window into this evolving problem. The state is aggressively seeking to reduce its carbon footprint and has made substantial increases in wind and solar power generation as well as in the promotion of electric vehicle purchases. One tool the state has used is the California Clean Vehicle Rebate Project, or CVRP, which kicked off in 2010 and offers consumers money back for the purchase of new EVs.

Now, an analysis of the CVRP’s impact on the state’s air quality from 2010 to 2021 reveals both good and bad news, researchers report May 3 in PLOS Climate.

The good news is that the CVRP is responsible for making a dent in the state’s overall CO2 emissions, reducing them by about 280,000 metric tons per year on average. The bad news is that the most disadvantaged communities in the state didn’t see the same overall improvement in air quality. Those communities in fact saw an increase in one type of air pollution, tiny particulates known as PM2.5. That increase may be indirectly related to putting more EVs on the road. Although electric vehicles themselves don’t produce PM2.5 from their tailpipes, increased electricity generation, if it’s not fossil fuel-free, can. Renewable resources, including rooftop solar cells, supplied about half of California’s electricity in 2022. But natural gas-fired power plants still provide a large part of the state’s power.

“Electric vehicles are often incorrectly referred to as ‘zero-emission vehicles’, but they’re only as clean as the underlying electric grid (电网) from which the energy is sourced,” Mejía-Duwan says. The most disadvantaged 25 percent of the state’s communities also contain 50 percent of the power plants, the team found.

6 . Young Alison Teal never rode in a pushchair or played on a swing on the playground.       1     She saw the view from atop a peak in Peru at just two months old on her mom’s back. They traveled the globe staying not at five-star hotels but in a six-foot-wide tent. From mountaintops to jungles, they immersed (沉浸) themselves in local nature and culture.

Between journeys they would return home to quiet part of the Big Island of Hawaii. Her front yard was the ocean, and her friends were dolphins.       2     Alison would dive into the water and release a sea leaf. A dolphin would catch it on its nose and throw it to the next player. Over the years, the dolphins grew to trust Alison.       3     She let them take the lead in their interactions. After studying at the University of California, Berkeley and then graduating from a film school, Alison continued her world travels. Her adventurous experience and survival skills landed her a spot on the reality show Naked and Afraid, in which she and a co-constant had to live on a deserted island for 21 days. Alison’s deep knowledge of how to live in a wildness saved the pair.       4     “After that, I couldn’t ignore our plastic problem,” says Alison. “I decided to protect our greatest resource, the ocean.”

Along with sharing her mission with her Instagram followers, the conservationist gave a TED talk on her discover.       5     Besides, she helped ban plastic bags in California. Her book, Alison’s Adventures: Your Passport to the World, is filled with travel tales and environment lessons. Alison believes all of us can make changes to protect the Earth.

7 . Coming upon a clear - cut in an old forest is a shocking experience. Tees large and small are collapsed one above the other in pile, and the ground is covered with the tracks of heavy machinery. Such was the scene when forest activist Zack Porter and I hiked a newly built logging (伐木) road in Green Mountain National Forest.

Clear - cutting in the American forests has long been widespread. But now, the Forest Habitat Creation Project represents new reasoning which is hotly debated - that clear - cutting benefits native creatures. The thinking is that clear - cutting done wisely can mimic natural disturbances, for example, from insect invasions or from storms overturning older trees that produce what ecologists call Early Successional Habitats - places where young trees and bushes get the upper hand and animals that depend on such habitat thrive.

The project also states that forests “can only be saved by being destroyed” - by keeping them young. Timber (木材) interests are enthusiastic about the approach because it lets them profit from cutting trees while claiming the significance of conservation. Hunting groups favor it because a younger, less thick forest makes it easier to find the game and birds they're tracking.

Nevertheless, Porter says, “Allowing some of the oldest standing trees in New England to be removed is equal to dereliction of duty on the part of the government, who sees the forests as commodities (商品).” “Forests can produce clean water, clean air, carbon storage, and biodiversity that we need,” he continues as we walk among lovely mixed hardwoods and evergreens that are cut down for logging. “We shouldn't be removing them for short - term gain.”

In this sense, Zack Porter's description of logging for wildlife for short - term gain - the short - term gain of favoring habitat for species people today want to see and hunt - is reasonable.

For those consuming Asian food, using chopsticks     1    (be) almost second nature. About 20 to 33 percent of people in the world use chopsticks     2     a daily basis. Not all of those are disposable (一次性的),     3     no doubt many are.

Felix Böck, a student at the University of British Columbia, was eager to find a way to recycle wood from construction projects, and he had a particular interest in bamboo. One day he found a drawer in his friend’s house     4    (fill) with disposable bamboo chopsticks, and an idea hit him.

He decided to give     5     second life to disposable chopsticks by making them into home     6    (decoration) or other accessories (配件). He told the idea to restaurant owners,     7    (convince) them to install recycling bins in their restaurants. He cleaned the chopsticks, pressed them into square pieces and coated them with glue. The square pieces were then     8    (creative) arranged into household and office products. Böck’s company, called Chop Value, has repurposed chopsticks into desktops, cutting boards and even table games.

Since 2016 when the company     9    (found), Chop Value has rescued billions of chopsticks from landfills. Instead of an economy of the typical take-make-dispose model, Chop Value seeks to create one     10     transforms waste into a usable resource.