Approximately 33% of thousands of two kilometer-long River Segments in the United States have been changing their colour shade, which’s been seen in satellite pictures since 1984.
That includes 18,715 kilometres that got greener, or went toward the violet finish of the shading range, as indicated by an investigation in the current week’s diary Geographical Research Letters. Some rivers portions also turned out to be more red, which was quite shocking.
People usually consider water as pure and clean if it’s in the shade of blue. And if that’s true then only around five percent of US river mileage is considered as blue. 95% is in different shades.
Around 66% of American rivers are yellow, which signals that they have heaps of soil in them, which also makes it not so pure to consume without purification.
Now about the remaining 28 percent rivers, they are green, which regularly demonstrates they are choked with algae growth in it. Furthermore, scientists discovered two percent of US rivers throughout the years moved from dark yellow to distinctly green.
“If things are becoming more green, that’s a problem,” study lead author John Gardner, a University of Pittsburgh geology and environmental sciences professor, said.
Although some green tint to rivers can be normal, Professor Gardener said it often means large algae blooms that cause oxygen loss and can produce toxins.
The study authors also mentioned that, “The chief causes of colour changes are farm fertiliser run-off, dams, efforts to fight soil erosion and man-made climate change, which increases water temperature and rain-related run-off.”