In this photograph taken on January 20, 2016, a Bangladeshi labourer walks among lines of freshly made bricks at a brick factory on the outskirts of Khulna some 266kms south of Dhaka. Very few of the brick kilns in Bangladesh - approximately 7,000, according to government estimates -- have been constructed following proper design and environmental rules, according to experts. And the consequences have been devastating as brick kilns are the largest source of greenhouse gases in Bangladesh, so much so that the smoke spewed out by them has been identified as one of the main factors behind the worsening quality of air in the country. AFP PHOTO/ Munir uz ZAMAN / AFP PHOTO / MUNIR UZ ZAMAN