【推荐1】Unlike thousands of tourists who hike in Yellowstone National Park to admire its natural landscape and hot springs every year, Abdelrhman Mohamed was traveling with a team of scientists to hunt for life within the hot springs.

After several hours of hiking in the Heart Lake Geyser Basin area, the team found four unpolluted pools of hot water. They carefully left a few electrodes (电极) placed into the land next to the water, hoping to attract little-known creatures out of hiding — bacteria (细菌) that can “ eat and breathe ” electricity.

After 32 days, the team returned to the hot springs to collect the electrodes. Working with other scientists, Mohamed had a look at the electrodes and found that they had succeeded in catching their small game: heat-loving bacteria that “ breathe ” electricity through the hard surface of the electrodes. These tiny creatures are not only of research interest, they may also hold a key to solving some of the biggest challenges facing humans.

As a means of fighting environmental pollution and creating more energy sources, such bacteria can “ eat ” pollution by changing deadly pollutants into less harmful matter and producing electricity in the process. “ As these bacteria pass their electrons (电子) into metals or other hard surfaces, they can produce a stream of electricity that can be used for low power applications, ” said Haluk Beyenal, a famous university professor of chemistry.

Though the researchers did not detail exactly how they would be continuing their work with the bacteria, it will hopefully lead to an exciting new tool for fighting climate change and pollution in the near future.

【推荐2】Hardscaping refers to non-organic features of a landscape such as pathways, driveways, walls, steps, and other human-made structures. The three Rs, which are common to many sustainability efforts, apply to hardscaping: reduce, reuse, and recycle.     1    

Reduce Runoff

You can reduce rainwater runoff by using permeable (可渗透的) materials that allow rainwater to get into the soil below.     2     Because, to use permeable materials, you need to dig deeper to set into multiple layers (层) of sand,tiny stones,and other materials that allow rainwater to permeate well, using them under a tree can disturb or even destroy roots that keep trees healthy and upright. It’s also a good idea to slope (倾斜) any impermeable surface to direct rainwater to your garden to save from watering it.

Use Recycled Materials

Consider using materials that are recycled from reclaimed (再生的) concrete, glass, or other construction materials that might otherwise end up in a landfill.     3     Your local landfill might sell other usable materials as well. Recycled wood can be used to make borders between different areas. Just make sure it hasn’t been treated with chemicals, especially if you grow food nearby.

Support Local Wildlife

    4     Using permeable hardscape makes the soil below beneficial to them, whether they are earthworms, ground-nesting bees and other beneficial insects, important microorganisms, or plant roots. Between hardscaped areas, plant native trees and flowers to create wildlife habitats.     5    

With careful planning and action, you can enjoy the convenience brought by hardscaping and at the same time be considerate to the environment and local wildlife.

【推荐3】A duck has been saved by the Royal Society for the Prevention of Cruelty to Animals(RSPCA) after getting stuck with a plastic ring around its neck. It is believed that the plastic ring is the same sort used to package cans of beer together.

Animal Collection Officer(ACO) Lauren Bradshaw was one of the three people to find and rescue the duck on the canal near Sellars Square in Manchester on August 23. They entered the water to reach the bird. “Our plan was to round up the duck and get him to a bridge as the width of the canal is smaller there,” Lauren said, “The duck managed to escape from us a couple of times but eventually we managed to net and catch him. Then I freed him and gave him an examination.”

She added that the plastic was fortunately not tight around the animal’s neck and did not cause any injuries or difficulty breathing. However, plastic stuck around the neck and throat area is a hazard to many sea animals, as the animals think it is food and, once trapped, are unable to remove it. She suggested that people cut open any plastic rings so that if they are deserted, they will not be able to trap animals like this.

Lauren also reminded people that ducks may starve to death due to litter being thrown away rather than being put in a dustbin. When hungry ducks swallow floating pieces of plastic, they can cut through their organs or trick them into feeling full, causing them to stop eating.

The RSPCA says it has received more than 21,600 reports of animals injured or caught in litter over the past five years.

【推荐2】An international team of researchers, led by Dr Christine Batchelor of Newcastle University, UK, used clear pictures of the seafloor to show just how quickly a former ice cover retreated (退去) at the end of the last Ice Age, about 20,000 years ago.

The team mapped more than 7,600 small-scale landforms across the seafloor. The ridges (山脊) are less than 2.5m high and are spaced between about 25 and 300 metres apart. These landforms are understood to have formed when the ice cover’s retreating edge moved up and down with the tides (潮汐), pushing seafloor into a ridge every low tide. Given that two ridges would have been produced each day, the researchers were able to work out how quickly the ice cover retreated. Their results, reported in the journal Nature, show the former ice cover rapidly retreats at a speed of 50 to 600 metres per day.

The seafloor landforms also give light into the way in which such rapid retreat can happen. Dr Batchelor and co-workers noted that the former ice cover had retreated fastest across the flattest parts of its bed.

“An ice can go away from the seafloor and retreat quickly when it becomes buoyant (有浮力的),” explained co-author Dr Frazer Christie. “This retreat only happens across relatively flat beds, where less melting (融化) is required to thin the overlying ice to the point where it starts to float (漂浮).”

The researchers believe that the quick retreat could soon be observed in parts of Antarctica. This includes at West Antarctica’s vast Thwaites Glacier. The authors of this new study suggest that it could go through quick retreat because it has recently retreated close to a flat area of its bed.

“Our findings suggest that present-day rates of melting are enough to cause quick short retreat across flat-bedded areas of the Antarctic Ice Sheet, including at Thwaites,” said Dr Batchelor. “Satellites (卫星) may well know this ice-cover retreat in the near future, especially if we continue our climate warming.”

【推荐3】The Earth set unofficial record high temperatures last week. Scientists said they were a clear sign of how pollutants released by humans are warming the environment. “Heat sets the pace of our climate in so many ways... it’s never just the heat,” said Kim Cobb. a climate scientist at Brown University.

Ocean warming, wildfire smoke and early arrived EI Nino that much of North America experienced this summer are other signs of climate troubles. Other recent natural events also show that climate change has entered new territory.

Most of the planet is covered by oceans, which have taken in 90 percent of the recent warming caused by planet-warming gases. In April, worldwide ocean temperature rose to 21, 1°C, which scientists believe was caused by a combination of planet-warming gases and the early EI Nino formation. EI Nino is a period of warning Pacific Ocean waters. Newly published data documented exceptionally warm ocean temperatures in the North Atlantic and also extreme sea heat waves near Ireland, Britain, and in the Baltic Sea.

High levels of wildfire smoke were more common on the US West Coast recently. Several rounds of smoke from wildfires in northern Canada brought dangerous air quality levels to eastern North America. Scientists say that climate change will make wildfires and smoke more intense and that the East Coast will see more of it.

The current EI Nino formed a month or two earlier than usual. It replaced La Nina that, with its cooling of Pacific waters, kept worldwide temperatures down. That means that it will have more time than usual to strengthen. It is predicted that there is a 98 percent chance that at least one of the next five years will be the warmest on record. One of these years would beat temperatures from 2016 when an exceptionally strong EI Nino was present.