The two sides in the debate over genetically modified crops issued warring reports assessing the first decade of the technology this week, as the industry's sunny view clashed with the darker vision of critics. The world's farmland planted with biotechnology crops reached 252 million acres in 2006, the industry-backed International Service for the Acquisition of Agri-Biotech Applications calculated in a report ... that promotes the products as solutions for hunger and future fuel demand. The report concluded that biotechnology boosts crop yields and benefits the environment. That view was challenged by Friends of the Earth International and the Center for Food Safety in a report released Wednesday. The two groups argued that engineered plants don't produce larger harvests than conventional varieties, are often more vulnerable to drought and have increased the use of pesticides. The United States and Argentina host about 70 percent of the world's biotech crop acreage, both sides said. But adoption of the technology is growing at a faster rate in developing countries than in industrialized nations, according to the International Service. About 10 million farmers in 22 countries sow genetically modified crops, it said. The dominant biotech crop is soybeans, with 57 percent of world acreage, followed by maize, cotton and canola. Opponents said the crops are mainly a boon to agribusiness and big agricultural chemical companies trying to increase sales of seeds, weed-killers and bug sprays. Biotech crop seeds are often engineered to be resistant to the herbicides or pesticides sold by the same company.