Blue-green algae that populate lakes in and of themselves are not harmful and form the basis of the riparian food web. Under certain conditions, however, the algae multiply rapidly, form blooms and produce toxins.
A new effort by the Punjab government to tackle air pollution caused by rice stubble burning is taking off as machines - called Happy Seeders - are given to farmers at a subsidized cost. The technology could reduce greenhouse gas emissions by as much as 78%.
A recent study by researchers in Peru and the US found that, in the past 35 years, there has been a 670% increase in the extent of pits and ponds created by miners digging for small deposits of alluvial gold in the Peruvian Amazon.
Authorities in New Delhi launched an anti-pollution campaign on Monday in an attempt to curb air pollution levels ahead of winter, when the capital is regularly covered in toxic haze, and warned that filthy air could make the coronavirus pandemic more dangerous.
The smoke from the fires in the Brazilian Amazon and Pantanal regions today covers more than four thousand kilometers in Latin America and affects the neighboring countries of Peru, Bolivia, Paraguay, Argentina and Uruguay.
Seattle's smoke shelters are among several emergency responses implemented in the last two weeks as wildfires rage across the western United States, burning about 5 million acres (2 million hectares) and spewing toxic plumes of ash and smoke.