Controvery, schcontroversy. As the biggest global user of certified-organic cotton for the second year running, H&M has plenty to crow about. The revelation comes courtesy of Textile Exchange, a nonprofit organization whose Organic Cotton Market Report looks back on 2011 as a “year of contradictions” filled with peaks and valleys. Among the high points? H&M, which not only maintained its position as the No. 1 buyer of certified-organic cotton but also increased its use of the white stuff by nearly 100 percent in 2011.