Step 1 : Introduction to the question "Which North American city is sinking by 3 feet per year?"
...Mexico City is sinking by an estimated one meter (3.2 feet) every year, while it simultaneously faces a water crisis. By 2050, 95 percent of North Jakarta could be submerged. Blame rising seas, but also the fact that the city is sinking 10 inches a year. Data from the US Geological Survey shows that parts of Houston have sunk around 10 to 12 feet since the 1920s. Today, the city's northwestern areas are sinking by as much as 2 inches per year. Like in New Orleans, the main culprit in Houston is excessive groundwater pumping.