Here's a link that describes the technology behind it: http://newsoffice.mit.edu/2013/how-to-get-fresh-water-out-of... ...and one showing the structure in detail: http://www.architectureandvision.com/projects/chronological/... TLDR: Great for pulling moisture out of the air if the air already has a really high moisture content. Pretty much useless in other circumstances.
According to the article, it's temperature differential that's important. So it works in the desert, which has 50 degree swings between day and night. Many places with high moisture content have much smaller swings in temperature, so it might not work as well in the jungle.
Alternately, the article is incorrect/oversimplifying. It's pretty easy to see that it is at least oversimplifying with a simple thought experiment: Suppose we were to place a Warka Tower in an airtight with a humidity of 0% (no water in the air) and with an air temperature of 120°F. Then suppose we were to drop the chamber temperature to 40°F. By all accounts, this is a huge change in temperature for a human-habitable region to undergo (an 80°F change), so the tower should produce a LOT of water. However, because the air in the chamber has so little water actually in it, very little water will actually be produced. Ultimately, what makes the tower work well is a large temperature change and a high humidity.