Copper

The Obama administration proposed the rule last year to ensure that companies demonstrate their ability to pay for environmental clean-up.

This landlocked country in Sub-Saharan Africa isn't a failed state in the traditional sense: There's no dictator, no child soldiers. But most of its 14 million people live on less than $1 per day. How did things get this way, and can they ever get better?

Inside the mining industry’s epic but surprisingly fragile push to keep pace with demand for the raw materials of modern life.

Worries about oil and gas hog the airwaves. But copper is also essential to keep the world running: It threads through your house, your computer, your eco-correct hybrid car. And it's getting just as difficult, expensive, and environmentally menacing as oil to extract. We have entered the era of tough ore.