LIMA, PERU -- Each afternoon, in the Santa Rosa slum built into the steep hillside surrounding Lima, a group of 15 women meet to knit. Surrounded by spools of alpaca yarn, they take up their needles and piece together scarves…

Since undertaking market reforms in late 1970s, China has enjoyed an economic boom -- but the economic progress has also produced serious environmental damage and pollution problems. Margaret Warner reports on China's environmental woes and their impact on the run-up…