Using a set of chopsticks only once, and then throwing them away causes problems for the environment. There are some movements which aim at telling people to use a set of chopsticks more than once. In China, about 45 billion pairs of disposable chopsticks are used per year. This is equal to 1.7 billion cubic metres of timber–about 25 million fully grown trees. China is the biggest producer of disposable chopsticks, about 60,000 people have a job making chopsticks. If production continues at the current level, China's forests will be gone in about a decade.