Though a border wall with Mexico is currently a matter of serious discussion in the United States, the aim of which is to prevent the physical movement of people (with few other apparent “benefits”), some walls can actually bring together and preserve communities, rather than divide them.

In only five years, the UN says, around 60 million Africans may be displaced as their land ceases to be arable, a potential humanitarian disaster the scale of which would be unprecedented. This would be devastating to a huge portion of the African continent not only ecologically and economically but socially as well.

That’s where Africa’s ingenious Great Green Wall comes in.

Experts at the United Nations say without action, desertification may claim two-thirds of Africa’s farmlands in under a decade. The Great Green Wall, however, was conceived as a wide-reaching strategy to halt Northern Africa’s rapidly advancing Sahara Desert.

The Great Green Wall, once complete, will stretch an incredible 4,400 miles from Senegal in West Africa to the East African nation of Djibouti. Instead of bricks and mortar, the wall will be made of trees and other vegetation, including plants that can be eaten or used to create medicine.

With only days to go before the deadline, Volkswagen AG (VW) and the U.S. government reached a partial settlement over how to deal with the automaker’s “dieselgate” emissions scandal.

Volkswagen agreed to fix or buy back some 500,000 vehicles caught up in the crisis. What wasn’t agreed upon is how much the company should pay in fines and compensation to consumers affected by the crisis.

Sustainability is a word tossed around much these days. But do consumers really care about buying sustainably? The answer is yes. More and more consumers are interested in sustainability, as surveys show.  A 2011 consumer survey by Nielsen found that 66 percent of socially-conscious consumers cited environmental sustainability as the most important issue from a list of 18 issues.

So, how do you increase awareness of buying sustainably among consumers? The key is getting information to them. A study by Michigan State University researchers, published in 2014 in the Business and Economics Journal, looked at consumer awareness of fair trade information. The researchers found that informed consumers “are better positioned to make sound decisions and take the appropriate actions to address sustainability issues.” Providing access to “complete and accurate sources of information allows consumers to draw the connection between their consumption behaviors and social, and environmental sustainability,” the researchers concluded.

Low gasoline prices and continuing performance issues have slowed the growth of electric car sales. But that has not stymied progress in electrifying larger vehicles, including garbage trucks, city buses, and medium-sized trucks used by freight giants like FedEx.

The clang of garbage cans will still probably wake people way too early in the morning. But in Santa Rosa, California, at least, the roaring diesel engine will be quiet, replaced by a silent, electric motor. 
 

New research can help water managers along the Rio Grande make wise decisions about how to best use the flow of a river vital for drinking water, agriculture and aquatic habitat. These studies also show how conditions from the prolonged drought in the West have affected the Rio Grande watershed.

The Rio Grande forms the world’s longest river border between two countries as it flows between Texas and Mexico, where it is known as the Rio Bravo. The river runs through three states in the U.S., beginning in southern Colorado and flowing through New Mexico and Texas before it forms the border with Mexico.

Parts of the Rio Grande are designated as wild and scenic, but most of the river is controlled and passes through several dam and reservoir systems during its 1,896 mile journey to the Gulf of Mexico. The river is managed through a complex system of compacts, treaties, and agreements that determine when and how much water is released along the river’s length.

Bicycle ownership around the world is declining amid rising wealth levels and increased use of motorised vehicles in developing countries, a study has found.

Four out of ten households on the planet own a bike, according to a paper based on surveys from 150 countries between 1989 and 2012. But the growing popularity and affordability of motorised transport, such as cars and scooters, “have disfavoured bicycle use”, the researchers say.

China in particular experienced a collapse in bike ownership rates since 1992, when 97 per cent of households had bikes. However, this dropped to 63 per cent by 2009, the study shows, with ownership rates in most other countries either flat or decreasing.

In Togo, bike ownership has remained stable at around 34 per cent of households between 1998 and 2010, but in Paraguay ownership rates dropped from 57 per cent of households in 1996 to 39 per cent in 2002, the paper states.

These trends could be expected as the number of motor vehicles per person has increased over the past decade at a rate “never seen before in human history”, in particular in China, India and parts of Africa, says Marc Shotten, a transport specialist at the World Bank’s Global Road Safety Facility in the United States.

Less than two months after 196 parties to the United Nations Framework Convention on Climate Change (UNFCCC) adopted the Paris Agreement, the global community is already seeing signs of it being a decisive turning point, according to a senior UN official dealing with climate issues. 

A month and a half since 196 parties to the United Nations Framework Convention on Climate Change (UNFCCC) adopted the Paris Agreement, the global community is already seeing signs of it being a decisive turning point, according to a senior UN official dealing with climate issues. 

“Much has been happening since Paris – the World Meteorological Organization (WMO) confirmed that 2015 was the hottest year on record, not just by a little but by a lot,” Janos Pasztor, who was today appointed as Senior Adviser to the Secretary-General on Climate Change, told reporters at a briefing in New York. 

Flint, Michigan temporarily switched its water supply from Lake Huron to the Flint River in April 2014 to cut costs. Should officials have known that lead contamination would result?

Clean-tech visionary Elon Musk first unveiled his idea for a high-speed ground transport system called Hyperloop back in 2013. The concept — in which passengers are transported in magnet-propelled capsules at more than 750 miles per hour — was quickly dismissed by many as a pipe-dream.

But, while most of us weren’t paying attention, a handful of private companies have been quietly working to make Musk’s vision a reality. Now two of these firms (both unaffiliated with the Tesla and SpaceX CEO) say they are ready to begin testing the technology.

Last week, the California Air Resources Board (CARB) said “no deal” to Volkswagen’s proposal to buy back some of the vehicles that were outfitted with cheat devices. According to CARB, the plan, which would see the recall of only a fraction of the 600,000 U.S. cars affected in the latest VW scandal, does “not adequately address overall impacts on vehicle performance, emissions and safety,” and would not fix the cars’ pollution problems quickly enough.