Houston fears climate change will cause catastrophic flooding: 'It's not if, it's when'

Human activity is worsening the problem in an already rainy area, and there could be damage worthy of a disaster movie if a storm hits the industrial section

Sam Brody is not a real estate agent, but when his friends want to move home they get in touch to ask for advice. He is a flood impact expert in Houston - and he has plenty of work to keep him busy.

The Texas metropolis has more casualties and property loss from floods than any other locality in the US, according to data stretching back to 1960 that Brody researched with colleagues. And, he said: "Where the built environment is a main force exacerbating the impacts of urban flooding, Houston is number one and it's not even close."