3 . A new study by scientists at Utrecht University concludes that about half of global wastewater is treated, rather than the previous estimate of 20%. Despite this promising finding, the authors warn that treatment rates in developing countries are still very low.

Humans and factories produce vast quantities of wastewater per day. If not properly collected and treated, wastewater may severely threaten human health and pollute the environment.

The authors use national statistics to estimate volumes of wastewater production, collection, treatment and reuse. “Globally, about 359 billion cubic metres of wastewater is produced each year, equivalent to 144 million Olympic-sized swimming pools,” says Edward Jones, PhD researcher at Utrecht University. “About 48 percent of that water is currently released untreated. This is much lower than the frequently announced figure of 80%.”

While the results show a more optimistic outlook, the authors stress that many challenges still exist. “We see that particularly in the developing world, where most of the future population growth will likely occur, treatment rates are falling behind,” Jones explains. “In these countries, wastewater production is likely to rise at a faster pace than the current development of collection and treatment basic facilities. This poses serious threats to both human health and the environment.”

The main problem, especially in the developing world, is the lack of financial resources to build basic facilities to collect and treat wastewater. This is particularly the case for advanced treatment technologies, which can be extremely expensive. However, the authors highlight potential opportunities for creative reuse of wastewater streams that could help to finance improved wastewater treatment practices.

“The most obvious reuse of treated wastewater is to increase freshwater water supplies,” Jones states. Treated wastewater reuse is already an important source of irrigation water in many dry countries. However, only 11% of the wastewater produced globally is currently being reused, which shows large opportunities for expansion.

“But freshwater increasing is not the only opportunity,” says Jones. “Wastewater also has large potential as a source of nutrients and energy. Recognition of wastewater as a resource, opposed to as ‘waste’, will be the key to driving improved treatment going forward.”

However, the authors stress the importance of proper monitoring of wastewater treatment factories, accompanied by strong legislation (法律) and regulations, to ensure that the reuse of wastewater is safe. The authors also acknowledge public acceptance as another key barrier towards increasing wastewater reuse.

5 . Our recommended list of environmental books covers a broad range of topics on conservation issues.

The End of Nature

Published in 1989, The End of Nature describes the relationship between nature and humans. It expresses the idea that nature was previously independent of humans but has now been affected by them in every way. According to author Bill McKibben, the idea of wilderness (荒野) is lost, and nature is no longer complete. The book focuses on the concepts of nature and wilderness and the value they have lost.

Silent Spring

Written by Rachel Carson, Silent Spring has been described as a landmark work of environmental writing and has brought an environmental movement into mainstream focus. The book highlights the bad effects of insecticides (杀虫剂) on the environment, especially DDT, which was a very popular insecticide until it was finally banned in 1972. The book eventually changed the insecticide policy in the United States and contributed to the creation of the Environmental Protection Agency.

The Sixth Extinction

The Sixth Extinction, by Elizabeth Kolbert, describes previous mass extinction events and connects them to many extinctions currently taking place. Kolbert studies the relationships between humans and the environment and finds that we are in the midst of the sixth mass extinction, which is caused by humans.

The Uninhabitable Earth

This book by David Wallace Wells provides a detailed look at how we treat the Earth and how our actions will affect us and the planet’s future. The Uninhabitable Earth argues that current actions will not be enough to prevent the effects of climate change. The author examines the disasters that have already occurred and looks ahead to the year 2100 and what climate change will do if we continue on our current path.

7 . 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.”

Aubrey, a mom of three, was breastfeeding her 10-month-old daughter in her Maui home last week when alarms started going off and she saw her entire neighborhood was covered in black smoke.

Aubrey and her husband Alex rushed out of the home and into their car, escaping with their 10-month-old daughter as well as their 6-year-old twin daughters. They didn’t take any necessities. In fact, they had never thought the wildfires would ever get to where they lived. After all, they were very far.

While Aubrey and her family eventually made it to safety, a relative’s home, they later learned their own home was burned to the ground.

They were left with no possessions, so Alex had to go to the neighborhood surrounding his relative’s home searching for supplies for his baby daughter Blue. He went door-to-door, asking if anyone had a baby and if there was a bottle or a diaper (尿布) and some extra milk.

One neighbor just had a baby so he gave Alex two bottles. And some neighbors gave Alex two diapers and some gave her three. Alex later said. “They were holding onto their own diapers too, which I understand.”

The disaster turned into a crisis for countless parents like Aubrey and Alex, who had to escape quickly and now needed basic supplies to keep their children alive and safe.

The wildfires claimed the lives of over 100 people, while many more remained missing. Officials on Maui warned that their supplies were running out.

Aubrey and Alex decided to travel to another island, Oahu, where they could stay in the home of Alex’s brother’s. There, they had more access to supplies like diapers and milk. Then they managed to contact with volunteers and left in a lifeboat for Oahu. Thinking those helpless people, they cried in pain.

Now on Maui, situations were becoming worse.

Together with other volunteers, Alex and his brother collected large quantities of supplies on Oahu.