Who's to blame for the toxic smog choking South East Asia?

Image source, Getty ImagesImage caption, Wildfires have been raging in Kalimantan, Indonesia for weeksByKoh EweReporting fromSingaporeAs Indonesia battles its worst wildfire season in a decade, a toxic smog is choking millions of residents in the region.The air on the islands of Kalimantan and Sumatra have turned an ominous amber, with air quality recorded at hazardous levels.The smog - also known as the haze - has also drifted beyond Indonesia's borders to neighbouring countries, raising public health concerns. It has obscured Singapore's skyline and forced some schools to close in Malaysia.Now, anger is mounting at the companies accused of burning farmland - as well as the authorities who have struggled to stop them.The annual dry season wildfires have been especially intense this year because of an unusually strong El Niño - a natural climate phenomenon which changes weather patterns around the world.According to independent forest monitoring platform Nusantara Atlas, 1,043,377 wildfire hotspots have been recorded in Indonesia, burning a total of 900,000 hectares of land.Many of these fires in Indonesia's forests and peatlands are caused by the razing of vegetation to clear land...