Two decades ago, the United States was the world’s largest creditor; now it’s the world’s largest debtor. As Ben Bernanke assumes the post of Federal Reserve chairman, succeeding Alan Greenspan, opin…

While some experts fault demand increases for record-high oil prices, others say production and market issues reflect price hikes are more complicated.

Loss of forests is a major contributor to greenhouse-gas emissions. Plans to devise a policy tool for using trees for carbon dioxide sequestration are now under way.

Backgrounder: Economists say Iran’s mismanaged energy sector and falling oil prices could have consequences for its economy.

Political volatility among the world’s leading oil producers suggests deeper causes for recent price spikes.