Afghan farmers work in a poppy field in Kunar province of eastern Afghanistan, May 16, 2012. According to a UN report, poppy cultivation in Afghanistan has been constantly increasing over the past 10 years. It is estimated that the country produces about 90 percent of the world's opium, the raw element for making heroin. [Xinhua]

A poppy field is seen in Kunar province of eastern Afghanistan, May 16, 2012. According to a UN report, poppy cultivation in Afghanistan has been constantly increasing over the past 10 years. It is estimated that the country produces about 90 percent of the world's opium, the raw element for making heroin. [Xinhua]

Afghan farmers work in a poppy field in Kunar province of eastern Afghanistan, May 16, 2012. According to a UN report, poppy cultivation in Afghanistan has been constantly increasing over the past 10 years. It is estimated that the country produces about 90 percent of the world's opium, the raw element for making heroin. [Xinhua]