2: Living in cities is dirty, tiresome and stressful.
What can technology do to make life more pleasant-especially when cities are growing bigger and more dirty every day?
In the second of two programmes, an in-depth view of the technologies used to make city living easier. What happens to all the rubbish we generate and what is the best way to get rid of it? How can you fix the drains without digging up the roads? Alun Lewis goes down a sewerto find out. Producer Helen Sharp