In our last blog we described how used plastic bottles get recycled as building material in new housing projects in Sub-Saharan Africa and Central and South America. Using products we normally would throw away is one way of dealing with waste and garbage, one of our biggest challenges

Why is it so important that we focus on cities in talking about 21st century technology challenges?  There are 3 reasons: Demographics Economics Revolution Demographics – As we stated in Part One on urban landscapes, more than half of us now live in cities. Economics – The

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