Apple Chief Tim Cook uploaded this picture on his account of Chinese social media weibo on Ocotber 21, 2015. He wrote, "Happy to be back in China! Started at dawn with a hike along the Wall on Chongyang Festival. Simply breathtaking."

Apple chief Tim Cook announced a plan to build 200 megawatts worth of solar projects in China on Wednesday. The move is expected to produce the equivalent of the energy used by more than 265,000 Chinese homes in a year and will "begin to offset the energy used in Apple's supply chain". The solar investment comes atop two previously announced solar farms in Sichuan, southwest China, that have now been completed, producing a combined 40 megawatts of power.

According to Apple’s statement, the company will also partner with suppliers, including iPhone maker Foxconn Technology Group, on an additional two gigawatts of solar, wind and hydropower projects. "Climate change is one of the great challenges of our time, and the time for action is now," Apple chief executive Tim Cook said in the statement. "We believe passionately in leaving the world better than we found it and hope that many other suppliers, partners and other companies join us in this important effort."

Cook recently joined the Paulson Institute's CEO Council of Sustainable Urbanization and was in Beijing for a meeting of the institute on Thursday. His Sina Weibo account, which amounted to 757,704 followers with 17 posts in last five months, says, "Happy to be back in China! Started at dawn with a hike along the Wall on Chongyang Festival. Simply breathtaking". Alongside is a picture of him hiking on a section of the Great Wall.

"I know some people are worried about the economy. We'll continue to invest," Cook said on Wednesday. "China is a superb place to be. Nothing has changed that."