Visiting Beijing to tout Apple’s environmental strides in China, Apple CEO Tim Cook told Xinhua he is “very bullish on Apple Pay” for the country, despite a series of snags that has kept the payment system from going live there. Once Apple Pay is available, Cook said he believes China will adopt it even faster than the U.S. has. China has already become a more lucrative market than the U.S. for iPhone sales, with Apple overtaking…