As people around the world celebrate Earth Day, Mexico City may serve as an unlikely environmental example for cities in developing countries suffering poor air quality.
Planetary carbon dioxide concentrations are the highest they've been in the past 800,000 years, an ignominious milestone for Earth Day 2013. Still, the world is making some progress toward addressing global warming.
Most efforts to address carbon emissions focus on preventing them from entering the atmosphere in the first place. But how to get rid of CO2 already there? Start-ups are developing prototype air-capture systems.
As Tax Day nears, Americans in the throes of preparing their returns may be dreaming of a simpler tax code. Here's why tax reform is such a tall order for Congress – and how two lawmakers are laying the groundwork for it now.
The French drove out Islamist rebels in northern Mali. But can France and its African allies translate those victories into regional stability and peace?
Caught between a distant government in Bamako and an Islamist rebel movement in their home region, Mali's minority Tuaregs face an uncertain future.
The horrifyingly bad air in Beijing is driving something of an expat exodus - as well as one by young Chinese executive types. The past three months have seen the worst air quality on record.
While the overall economic picture for Egypt is a gloomy one, a tiny, fabulously wealthy class remains that continues to prosper despite the grimmest economic conditions in decades.
Egypt needs IMF money to stay afloat, but the international lender is demanding tough subsidy cuts from an already-embattled government.
The only big Medicare reform idea that's been pitched in public is called 'premium support,' championed by Rep. Paul Ryan (R). Here's how it would work, and here's why Democrats deride it as a 'voucher.'
The US spends twice as much per person on health care as other advanced economies, and Medicare is one of the biggest culprits. But here's why cutting its costs won't be easy.
As Venezuela prepares to elect a new president, the focus has turned to whether Chávez's legacy – a petroleum-fueled political-economic system he referred to as socialism for the 21st century – can last.
Some 17 countries receive shipments of crude or refined oil products with preferential repayment terms under the Petrocaribe energy pact. But some nations fear oil shipments could stop post-Chávez.
Billionaire and New York Mayor Michael Bloomberg taps his money, and political zeal, to counter the political clout of the NRA. The gun rights group sees 'billions of reasons to take him seriously.'
New York Mayor Michael Bloomberg is on a mission to challenge the NRA's longtime sway over gun policies. Here are the strengths each side brings to the gun-control debate.
President Obama arrived in Israel today for a regional visit in which he will have to juggle three rapidly ticking time bombs: the Israeli-Palestinian conflict, Syria's war, and Iran's nuclear program.
Scientists and space enthusiasts are trying to discover how humans would manage missions beyond the moon. A proposed 2018 mission to Mars is adding urgency.
Drones are not just for tracking terrorists abroad. Some 327 are authorized to fly in US airspace – most for military training. But as their numbers grow, so is domestic scrutiny.
Ten years after the Iraq invasion, reporter Scott Peterson recalls the day a suicide attack threw him out of bed in a formerly quiet Baghdad neighborhood – and blew a hole in any sense that the war was keeping its distance.
Andy Nelson, who photographed the US invasion of Iraq, recalls the pulling down of Saddam's statue – and early signs of chaos.
In the new Iraq, old sectarian fears remain. Around Baghdad's Green Zone, the fortified seat of government, concrete walls pulled down a year ago are going back up.
What did the post-9/11 border patrol surge of manpower and equipment achieve? Understanding its successes and failures could be crucial to the new immigration reform effort.
Stubbornness over conflicting claims to the Diaoyu/Senkaku islands in the East China Sea holds out the prospect of competing maritime patrols and continued tensions, raising the risk of an incident.
Making real sanctions bite would threaten the North Korean regime's stability, and an imploding North Korea could mean refugees flooding across the border, say Chinese scholars.
In a historic moment of coincidence, new leaders are taking the helm in China, Japan, and South Korea, providing an unprecedented moment for the region to refresh relations.