Fossil fuels — coal, oil and natural gas — are some of the world's most coveted goods. As the need for energy continues to rise worldwide, rapidly industrializing and developed nations alike are grappling to ensure adequate supply levels. We wonder: Based on current trends, for how many years will existing oil reserves cover demand?
Washington, D.C. is home to the U.S. federal government and world-famous monuments. With its many trees and parks, it is also considered one of the greenest capitals in the world. Yet, we wonder: How does the Washington region’s carbon dioxide output compare on a global scale?
Amidst all the headlines and news reports about India and its economic, social and technological progress, the size of its population remains a recurring theme. We wonder: Just how large was India's population back in 1955 — slightly over 50 years ago?
Nearly 5.8 trillion cigarettes were sold worldwide in 2006 — enough for 860 cigarettes for each person in the world. As many cities and countries have taken steps to mitigate the health concerns associated with smoking, we wonder: Which of the following countries has the highest per capita cigarette consumption?