This document discusses the rise of pollution levels in China and provides context around factors that have contributed to this issue. It notes that China is now the largest emitter of CO2 in the world. Industrialization and China's incorporation into the global economy as a manufacturer have relied heavily on fossil fuels and put pressure on China's environment. While China's choices are important, the author argues that sustainable development needs involvement from all major players in the global economy, not just China, as pollution is a global issue not started by any one country.