Human activities are exposing US rivers and streams to a cocktail of salts, with consequences for infrastructure and drinking water supplies. Road salt, fertilizers, and mining waste – as well as natural weathering of concrete, rocks, and soils – all contribute to increased salt in waterways. When these different salt compounds combine, their harmful effects can amplify.
A tipping point is a point in time when a small thing can make a big change happen. The term was popularized in sociology in recent decades, but really comes from physics where is refers to adding a small amount of weight to a balanced object causing it to topple over.
Back in February, we did a story about a rapidly-growing crack in the fourth-largest ice shelf in Antarctica. At that time, the crack in the Larsen C ice shelf was more than 100 miles long and was growing at a pace of about 5 football fields a day.
There is a tendency to think of the changes in the energy industry as a pitched battle between fossil fuel companies and renewable energy. There is some truth to this, but only to a certain extent. The multi-trillion-dollar fossil fuel industry is made up of businesses dedicated to growth and increased profits. And like businesses in other industries when major changes occur, fossil fuel companies may read the tea leaves and change with the times.
According to a new report from the World Wildlife Fund, the world’s animal populations have suffered widespread population declines in the last half century. And thousands of species are now scrambling to survive.
Perdue Farms, the fourth-largest poultry producer in the United States, produces over 60 million pounds of chicken a week. They are arguably the most progressive of the giant poultry companies. Two years ago, they were the first to renounce routine antibiotic use. In late June, they announced a comprehensive animal-welfare plan – the first among large producers – that will change how its chickens are bred, raised and killed.