In our last blog we talked about the challenge of dealing with solid urban waste in cities in both the Developed and Developing World. With urban growth in the 21st century expected in cities of the Developing World, add managing the air to the litany of challenges to be faced and ove

In 1800, 2% of us lived in cities. By 1950 that number had grown to 30%. In 2007 we surpassed 50% and forecasts for 2050 based on present growth indicates that 65% of us will be urban dwellers. Before World War II, the majority of humanity lived on subsistence farms supporting large f