The impact of climate change on the spread of disease and the affect on world health could be dramatic. In this episode of “Hot Cities” we go to Jakarta, a sprawling city of 12 million people. It's also under threat from a new increase in dengue fever, for which there is no cure. Even rich countries are vulnerable. A deadly heat wave hit Chicago in 1995 killing hundreds of people. “Hot Cities” looks at the adaptation strategy Chicago has introduced to make sure it does not happen again.