How Can Cities Encourage Residents to Live More Sustainably?

This week's The Big Fix looked at a very basic need: water, and how cities can get residents to conserve it. In Tuscon, the city waged a decades-long PR campaign that included public service ads and a mascot that can be hired for parties. In Yemen, the situation is more dire—without dramatic action, Sana'a could become the world's first waterless capital by 2017. So far, the government there has done nothing, despite repeated calls for action. Below, we've rounded up the most interesting responses we received this week.

Some commenters took issue with our claim that Tuscon could serve as a model. Commenter Alan: