India faces dwindling supplies of potable water, threatening the health of millions of people.

Warren Buffett’s divestment from PetroChina prompted victory cries from Darfur activists, but longer-term concerns seem a more likely explanation for the sale.

U.S.-India relations may suffer a serious setback if the stumbling nuclear deal collapses.

Cholera in Iraq continues to spread, and experts can’t seem to get a handle on the unsanitary water responsible for making so many people sick. 

A gathering of the world’s top greenhouse-gas emitters provides President Bush an opportunity to recast his administration’s approach to climate change, but skepticism remains high.

Hailed for saving the ozone layer, the 1987 Montreal Protocol is attracting fresh attention as a weapon against climate change.

Shortages of skilled labor in Canada’s oil sector are causing wages to rise and could cause global ripples in the industry.

Two years after Hurricane Katrina, U.S. cities still struggle to safeguard themselves against such natural disasters.

A spike in global food prices, rising at a rate not seen in three decades, has been blamed by some on surging demand for biofuels. Others, however, say this oversimplifies the case.

Governments employ new high-tech methods to catch those employed by the multibillion dollar business of illegally trading in endangered animals, but the market for exotic beasts persists.

The U.S. signals new efforts to pressure Iran just as it seeks to expand ties with resource-rich states in the Shanghai Cooperation Organization.

In an echo of the 1960s, Venezuela, Russia, and Bolivia are among a number of countries trying to renationalize the property of multinational corporations.

As the North Pole’s ice cap gives way to global warming, countries bordering the formerly inaccessible Arctic are now vying to claim its untapped resources.

Recent reports on the world’s energy supplies forecast a coming energy crunch, but how soon and what it means for oil prices is still up for debate.

The peculiar resolution to an international standoff with Libya over detained foreign medics may have stemmed from Europe’s need for Libyan energy resources.

Japan’s nuclear power plant accident, triggered by an earthquake, is a reminder of the trouble in building nuclear power plants near fault lines.

Wrangling over international quotas for bluefin tuna highlights the broader problem of an overall decline in wild fish stocks.

Leader of the world’s ethanol industry, Brazil is brokering cooperation agreements from India to sub-Saharan Africa. But the outlook for an international biofuels market remains uncertain.

As a new round of sanctions against Iran approaches, it remains uncertain if the measures will be tough enough or able to persuade Tehran to suspend its nuclear program.

China’s increasing coal use and inability to control toxic emissions from coal plants cast a shadow over the fight against global warming.