Mario Draghi, president of the European Central Bank, fended off the dragons with the declaration in July that "Within our mandate, the ECB is ready to do whatever it takes to preserve the euro. And believe me, it will be enough."

Draghi has promised the bank has unlimited liquidity to buy sovereign debt, as long as governments (most likely Spain) submit to reforms designed to balance their budgets. But in 2013, the markets will want more than brave talk, including real progress toward banking and fiscal union that will leave behind what Draghi likes to call Europe's "fairy world" of unsustainable debt and collapsing banks. Nothing can be done without the say-so of German Chancellor Angela Merkel, renowned for a step-by-step approach that's likely to be even more cautious in a year when she faces re-election.

Elections in Italy in February may be more important -- pitching technocrat Prime Minister Mario Monti against the maverick he replaced, 76-year old Silvio Berlusconi. After the collapse of Berlusconi's coalition 13 months ago, Monti reined in spending, raised the retirement age and raised taxes to bring Italy back from the brink of insolvency. Now he will lead a coalition of centrist parties into the election. But polls suggest that Italians are tired of Monti's austerity program, and Berlusconi plans a populist campaign against the man he calls "Germano-centric."

The other tripwire in Europe may be Greece. More cuts in spending -- required to qualify for an EU/IMF bailout -- are likely to deepen an already savage recession, threatening more social unrest and the future of a fragile coalition. A 'Grexit' from the eurozone is still possible, and that's according to the Greek finance minister, Yannis Stournaras.

Expect to see more evidence of climate change

Hurricane Sandy, which struck the U.S. East Coast in November, was the latest indicator of changing and more severe weather patterns. Even if not repeated in 2013, extreme weather is beginning to have an effect -- on where people live, on politicians and on the insurance industry.

After Sandy, New York Gov. Andrew Cuomo said that after "the last few years, I don't think anyone can sit back anymore and say, 'Well, I'm shocked at that weather pattern.' " The storm of the century has become the storm of every decade or so, said Michael Oppenheimer, professor of geosciences at Princeton.

"Climate change will probably increase storm intensity and size simultaneously, resulting in a significant intensification of storm surges," he and colleagues wrote in Nature.

In the U.S., government exposure to storm-related losses in coastal states has risen more than 15-fold since 1990, to $885 billion in 2011, according to the Insurance Information Institute. The Munich RE insurance group says North America has seen higher losses from extreme weather than any other part of the world in recent decades.

"A main loss driver is the concentration of people and assets on the coast combined with high and possibly growing vulnerabilities," it says.

Risk Management Solutions, which models catastrophic risks, recently updated its scenarios, anticipating an increase of 40% in insurance losses on the Gulf Coast, Florida and the Southeast over the next five years, and 25% to 30% for the mid-Atlantic and Northeastern states. Those calculations were done before Sandy.

Inland, eyes will be trained on the heavens for signs of rain -- after the worst drought in 50 years across the Midwest. Climatologists say that extended periods of drought -- from the U.S. Midwest to Ukraine -- may be "the new normal." Jennifer Francis at the Institute of Marine and Coastal Sciences at Rutgers University has shown that a warmer Arctic tends to slow the jet stream, causing it to meander and, in turn, prolong weather patterns. It's called Arctic amplification, and it is probably aggravating drought in the Northwest United States and leading to warmer summers in the Northern Hemisphere, where 2012 was the hottest year on record.

It is a double-edged sword: Warmer temperatures may make it possible to begin cultivating in places like Siberia, but drier weather in traditional breadbaskets would be very disruptive. The U.N. Food and Agriculture Organization reports that stocks of key cereals have tightened, contributing to volatile world markets. Poor weather in Argentina, the world's second-largest exporter of corn, may compound the problem.

More cyber warfare

What will be the 2013 equivalents of Flame, Gauss and Shamoon? They were some of the most damaging computer viruses of 2012. The size and versatility of Flame was unlike nothing seen before, according to anti-virus firm Kaspersky Lab.

Gauss stole online banking information in the Middle East. Then came Shamoon, a virus that wiped the hard drives of about 30,000 computers at the Saudi oil company Aramco, making them useless. The Saudi government declared it an attack on the country's economy; debate continues on whether it was state-sponsored.

Kaspersky predicts that in 2013, we will see "new examples of cyber-warfare operations, increasing targeted attacks on businesses and new, sophisticated mobile threats."

Computer security firm McAfee also expects more malware to be developed to attack mobile devices and apps in 2013.

U.S. Defense Secretary Leon Panetta is more concerned about highly sophisticated attacks on infrastructure that "could be as destructive as the terrorist attack on 9/11."

"We know that foreign cyber actors are probing America's critical infrastructure networks. They are targeting the computer control systems that operate chemical, electricity and water plants and those that guide transportation throughout this country," he said in October.