Pollution needs no travel visa

Telegraph: China’s pollution closes South Korea schools
Having one country’s environmental recklessness affect another is nothing new (North Americans drive SUVs which contribute to the droughts that kill millions of Saharan Africans; US rust belt auto manufacturing creates acid rain that falls on Canada) but this is a new one: this week, dust storms laced with toxic pollution blew from China into South Korea, forcing them to close schools and alter their lifestyles. Yet another potential cause for future wars?