This is neither good nor surprising news.
What kills more people than HIV, malaria and tuberculosis every year? Air pollution. Tack on fouled water and poisoning by toxic waste and pollution killed 8.4 million people in 2012—or nearly three times as many people as those three diseases. Combined.
That's according to a new analysis by the Global Alliance on Health and Pollution based on data collected by the World Health Organization.
The problem is people breathing in the fumes of cooking fires in smoky homes or the soot from coal-fired power plants outside. Or there's the suffering caused by raw sewage in the water supply or poisonous heavy metals that get into the soil via industrial waste.
http://www.scientificamerican.com/podcast/episode/pollution-kills-millions/