the one of the biggest problem of 21st century. no one thinks of it and who thinks no one cares of it. you may guess it is pollution. the world only cares for money , but no one will give money for "helping to get a good environment and also one point I should mention it is if you make pollution try to digest it by making creative things or recycling it and also I should like to tell you the most polluted countries of world are Bangladesh, pakistan, afghanistan and mongolia these are...