⑵ For many firms that do business in Europe, the certification of their recycling processes from the International Standards Organization is a must-have. Toxic materials such as lead, mercury and other heavy metals are used liberally in electronic devices, and burying them in landfills poses a future hazard if the metals leak into groundwater. While European countries have stringent recycling regulations, government mandates in the United States are less demanding. In America, large corporations are at the forefront in pushing for electronics recycling.（20 分）