Tube trains and railways ground to a halt, trapping thousands of people underground and stranding tens of thousands more on rainy platforms.

ECONOMIST: Power industry

About 80 percent of New Orleans was flooded last week when levees collapsed in Katrina's wake, trapping thousands of the city's poorest residents.

CNN: Campaign reportedly urged self-reliance for poor

Thousands of schools collapsed in the earthquake, trapping students under the debris.

CNN: China quake scars linger amid rebuilding