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

The United States has pursued missile defense technologies for six decades, with mixed results. Changes under the Obama administration, including adjustments to planned defenses in Europe, could port…

Though shifts in demand and reduced production by some major producers have influenced oil prices, investor behavior is also increasing market volatility.

President Barack Obama says he will seek vigorous climate-change policy. Efforts to curb greenhouse gases pose considerable economic pitfalls, as well as opportunities.