In post-earthquake Haiti, members of the Bohoc community rehabilitate and widen a road. Photo: Lisa Hoashi/Mercy Corps.

In minutes, everything was gone.

The funnel clouds from one of the United States’ worst tornado seasons in years destroyed homes, bridges, schools, and anything else in their path. While the loss is catastrophic, the reconstruction period that follows a natural disaster can create interesting economic niches and opportunities for those seeking to put the pieces back together.

This kind of destruction is not unique to the U.S. Catastrophes around the globe cause economic shifts. Sometimes this means a transformation in a country’s economic structure, but on occasion, disaster can spark positive changes.

In an example of structural transformation, massive winter flooding in Colombia recently put millions of acres of land underwater — having disastrous effects on the country’s dairy, agricultural, and cut flower industries. Colombia had planned to transform its eastern plains into the country’s primary agricultural sector, doubling the amount of land under cultivation, but the flooding presented a major roadblock. “...[I]n just a few hours we are losing what has been 35 years in the making,” one dairy farmer told Reuters.

Last year’s floods in Pakistan, the earthquake in Haiti, and Hurricane Katrina (to name a few) disrupted millions of lives and wiped out or severely destroyed local and national economies. Recovery may take decades.

But disasters have also spurred interesting new economic developments. The floods in Pakistan washed away thousands of miles of roads and railway lines, many bridges, almost 10,000 schools, and 1.7 million houses. Rebuilding them represents an enormous business opportunity. It is also a chance to introduce more resource-efficient practices in industries like agriculture, livestock, and dairy farming that were wiped out by the floods, Pakistan’s High Commissioner to the UK, Wajid Shamsul Haman, told Reuters.

Indeed, the destruction of infrastructure and existing institutions sometimes represents an opportunity to rebuild in new and improved ways. In March 2010, the Haitian government unveiled a plan to rebuild the nation that seeks to redistribute a large portion of the population to smaller, less disaster-prone cities, according to the New York Times. Building up the infrastructure in these smaller communities should create an economic incentive for people to stay. Planners hope that a decrease in Port-au-Prince’s population will help to alleviate many of the social problems related to overcrowding that it faced before the earthquake.

New Orleans experienced massive job loss following Hurricane Katrina, but by 2008 it had regained 99 percent of its pre-storm total thanks to thousands of new jobs in construction and government, says the New York Times. Some companies and nonprofits incorporated green building practices as part of the rebuilding process, according to the Christian Science Monitor. In fact, the New Orleans school system, which was in many ways failing before the hurricane, is ranked as the most reform friendly city for education by the Thomas B. Fordham Institute, says the Christian Science Monitor. Test scores and graduation rates are both up. In some ways, the city is experiencing a rebirth.

A natural disaster is, of course, still a disaster. Even the best-laid reconstruction plans may never materialize. This is especially true in the developing world, where the wounds left by a disaster are more severe and take longer to heal. Scientists predict the world will experience more severe natural disasters in greater numbers in the coming century, says The Guardian. That means more floods, more hurricanes, and more tornadoes like the one that recently ripped through Joplin, Missouri. It also means that now, more than ever, we need to understand how to create positive economic change in a disaster's aftermath.