1 . Time is running out for coral reefs as the climate gets hotter. So scientists are searching the globe for corals that are better at enduring heat, Now, new research shows how those “super corals” can survive: less roommate drama.

Reefs depend on a crucial partnership between the corals and the algae (海藻) that live in the corals’ tissue, The algae make food for the corals using sunlight and in exchange, get a nice spot to live. But when oceans heat up, that relationship goes bad, and the corals kick the algae out, Without their roommates, corals can die, turning a ghostly white, bleached (白化) color.

Still, some corals seem to resist bleaching better than others, A new study shows that those corals depend on algae that are better at tolerating heat. Researchers hope that pinpointing these abilities will help develop new conservation tools to preserve the world’s reefs as temperatures rise. About 1/4 of all marine life rely on coral reefs in some way, along with half 1 billion people around the world also depend on reefs for their food and livelihoods.

“Heat stress can kill a lot of corals really fast,” says Kate Quigley, a research scientist at James Cook University and the Minderoo Foundation in Australia. “I hope that nature does have some mechanisms to get us through the next few years while we get our act together.”

While the hope is that those algae could also aid in reef conservation in the future, researcher Patrick Buerger says it’s likely that it wouldn’t help all coral species. And even the toughest corals can only endure so much. Currently, the world is on track for just under 3degrees Celsius of warming by 2100, a level that would wipe out nearly all coral reefs.

“The action has to be on climate change,” he says. “This is a short-term solution that might buy some time for corals to adapt. But the main focus has to be on climate. There’s not a silver bullet to the problem.”

2 . The combined quantity of water on Earth has varied over the course of our planet’s geological history, and it still does.

Today, Earth includes some 1,386 million cubic kilometres of water, a volume that includes water in oceans, lakes and rivers, plus ground water, vapour in the atmosphere, and the frozen water of glaciers and ice caps. On the young Earth — some four billion years ago — vast quantities of water were added to the planet by ice-containing comets (a mass of ice and dust that moves around the sun and looks like a bright star with a tail) that struck us, eventually making our world a “blue planet”. But such events became increasingly rare in Earth’s more recent history, and today we are in an age during which Earth is losing water.

The water loss is due to the fact that particles (微粒) sometimes escape Earth’s gravity to travel into space. This is particularly true of the light hydrogen atoms that form part of water molecules (分子) together with oxygen. Every time the atmosphere loses hydrogen, we lose one of the building blocks of water. Scientists estimate that Earth loses about 3kg of hydrogen per second. At this pace, Earth would run out of water in three billion years — but that assumes that we don’t get any new water supplies.

New water need not come from space — it might come from the inside of the Earth. At depths below 50km, minerals contain water that is not reckoned within the water cycle. Some of it dates back to Earth’s formation; the rest is part of slow geological exchange between the planet’s layers. When Earth’s plates sink and melt, deep minerals can release these bound water molecules so that they can subsequently rise to the surface via volcanic eruptions, adding to the planet’s overall water resources.

3 . I was mostly based in Samburu National Reserve, recording details of the population and leading collar (颈圈) operations. We put trackers (跟踪仪) around wild elephants’necks, so we can learn about their activities.

In May 2009, in the middle of the wet season, Rommel appeared again. And it was histurn to be placed a collar. We sent three cars out to search for him. There’s a river running through the park where many elephants gather in the mornings. At 10:30 am, one of my partners clocked Rommel.

A tranquillizer (镇静剂) was carefully shot into his body so we could safely place a collaron him, but for a bull of Rommel’s size it could take longer. After that, he turned away, heading in an unexpected direction and seemed to be near danger by killing himself in thewater. It would be a bad accident. Only by pulling his trunk (象鼻) from the river, could weensure his survival. The problem was that the river was a little bit changeable. Immediately, I decided to act. I jumped in and lifted his heavy, twitching trunk from the water with the help of lifeguards. The team tried to fit him with a collar, but we discovered that we didn’t have one big enough.

We couldn’t risk keeping him there while we created a bigger collar. So I struggled on, holding his trunk high with all my strength. And medicine that took away the efforts of the tranquillizer was delivered.

As soon as his ears started to move, a sign of coming to life, I dropped his trunk and moved to safety. Within a couple of minutes, he was back to life. That was one of my proudest moments

5 . For many people, retirement is a chance to take a break. Not so for Victorin Laboudallon from the Seychelles who spends his days planting forests to fight climate change. Wherever there’s a forest fire in the Seychelles, you can be sure you’ll find Laboudallon ready to fight back, armed with seeds and shovels.

Laboudallon is widely known across the Seychelles for his decades of environmental action and his big personality. While planting trees in the wet dirt, barefoot and laughing, he says his surname means “friend of the mud” in his local Creole language. “I’m not somebody who lives under the big concrete. I live under the beautiful trees,” he says, pointing above at the iconic coco de mer palm.

The Seychelles is a nation of 115 islands—known for beautiful beaches and biodiversity—off the east coast of Africa. Here climate change is not a distant prospect, but a daily reality. “We’ve got the sea rising,” says Laboudallon. “You can see places where there used to be houses. Now there are none. There is something on this planet going wrong.”

Nature enthusiasts like Laboudallon have taken matters into their own hands. While giving a tour of his tree nursery, he explains how different types of trees offer different services when adapting to climate change. For the Seychellois, mangroves (红树林) are fundamental.

Mangroves defend against the impacts of rising seas and coastal erosion (腐蚀) by reducing the height and force of the waves before they hit the shoreline.

This strategy of using nature—and the services it provides—to adapt to climate change is known as ecosystem-based adaptation. It’s often cheaper than concrete infrastructure (设施). Not to mention that it creates a space for nature. Communities can adapt to climate change while protecting biodiversity. It is no longer a choice between people and nature. Considering the Seychelles’ economy is highly dependent on ecotourism, ecosystem-based adaptation is seen as a promising approach.

7 . As days are getting shorter and colder, people can often find themselves feeling sad or lacking the motivation to do anything. One possible reason for those feelings is seasonal affective disorder (SAD), which is common during the cold months.     1     If your dog loses interest in its favourite games or walks, they may be experiencing it. Here’s how to give your dog’s mood a boost.

Analyzing your dog’s behaviour will help you get a better understanding of whether they may be feeling sad.     2     Knowing what to expect throughout the day and feeling comfortable in their surroundings is very important for a dog.

Even when you’re inside, make sure to spend time playing or training your dog. Try to come up with new games that require you to interact with your dog. This is a great way to get your pet excited and boost their mood, and yours, too.

As with humans, the lack of sunlight during the winter can cause lower mood levels, so it is very important for your dog to get as much sunlight exposure as possible.     4     You can also try other strategies such as moving their bed closer to a window, or even use more artificial lighting.

The winter months are colder and darker, and it might be inviting to skip an exercise or a walk outside, but much like humans, this can have a significant effect on your dog’s mood.     5    

8 . Our two-year investigation into caged (关在笼中) tigers in America sent us through 32 US states—with some truly shocking experiences. But as the deadline neared, I still needed a powerful and hopeful image.

When we began our reporting in 2017—Sharon, writing; me taking photos; and our son, NickRuggia, filming—more tigers likely lived in cages in the US than remained in the wild. The number ranged from 5,000 to 10,000, but without strict government oversight, no one knew for sure.

Roadside zoos that allowed tourists to take pictures of young tigers were the main cause of what’s been called a US tiger crisis (危机). Caged cats often ended up in the illegal wildlife trade. Young tigers, parted from their mothers at birth, were fed poorly and touched by hundreds of people. When they grew too big and dangerous to pet at around 12 weeks, young tigers were put on show, or simply disappeared.

While we documented the unpleasant part of this industry, we also wanted to show the good life these impressive animals could have. With two weeks left before my deadline, I headed to the Wild Animal Sanctuary near Denver, where well-cared cats walked freely in their habitat.

There I met Clay, Daniel, and Enzo, three of 39 tigers rescued from an animal park in Oklahoma. These nearly grown cats raced beside our car, which I’d seen only in the wild. It was a hot July day and soon two of the cats jumped into a pool to cool off. The third rested beside them on the ground. I crossed the road to take a picture of them. Then quietly, I came up close, trying not to disturb (打扰) them. I had the shot.

9 . As children, we used to listen to a song called “Sharing is Fun”, which was all about how we can enjoy things better when we share them. I was not always sure I agreed, particularly when it came to sharing my snacks with my two brothers.

But later, I come to be aware that the old German children’s song seems to be true — at least for humans. We altruistically (利他地，无私地) share food: in both hunter-gatherer and industrialized societies; there are customs and institutions to provide needy people with food, even when it is scarce and the donator needs the food themselves.

In a study in Leipzig, three-year-old children were presented with a task in which they had to pull a board with an unequal amount of sweets on either end. If there were five jellybeans on one side of the board and only one on the other side, the children would divide the treats so that everyone got the same amount.

In a very recent study, the 19-month-old infants tested witnessed an experimenter pick up a desirable fruit, “accidentally” dropping it out of reach. When the experimenter tried to reach for the dropped fruit with his outstretched arm, these little kids handed over the fruit, surprisingly even if they were hungry themselves.

It is well known that wolves provide their children with food, but this is probably an inborn action that can be explained by kin selection. Chimpanzees do share food with each other. But there is a difference in terms of with whom, why, and how chimpanzees share. Chimpanzees share independently of the effort each individual invested in the cooperative hunt — in contrast to the above-mentioned children who worked together to pull a board.

Evolutionary scientists have explained human food sharing like this: by giving away food to strangers, individuals may promote partnership and group cohesion (凝聚力), thereby helping the species succeed within the dynamic environment of evolutionary adaptation.