Due to the warm weather on June 12, blue-green algae increased rapidly in parts of Chaohu Lake, in East China's Anhui province. The local water department has taken measures to ensure the safety of the drinking water. [Photo by Bai Xing / China Daily]

Farmers work in the roof vegetable garden at a local textile company in Shaoxing city of Zhejiang province, June 12, 2012. The company hires three farmers to grow green vegetables on the 4,800 square meters roof of its main building. More than 40 kinds of vegetables are planted in the roof garden and they could provide food for workers in the company. [Photo/Xinhua]