Roadside bombings doubled , and rose in Afghanistan in past year . U.S. ambassador says cultivation of wild plants used for heroin declined . US President - Elect Barack Obama has vowed to tackle resurgent Taliban . He said there were 1,000 improvised explosive device blasts in 2007 and 2,000 this year . Up to 30,000 additional U.S. troops will be deployed to Afghanistan in future .
Roadside bombings doubled , and rose in Afghanistan in past year . U.S. ambassador says cultivation of wild plants used for heroin declined . US President - Elect Barack Obama has vowed to tackle resurgent Taliban . Up to 30,000 additional U.S. troops will be deployed to Afghanistan in future .