Cities are major contributors to climate change and are also vulnerable to its impacts. Drastic actions are required in cities if we are to avoid runaway climate change.  Runaway climate change is a likely consequence of the melting of the Siberian permafrost.  

Some cities, such as Bogota in Colombia, have made large investments in the transformation of its transport systems. It has facilitated the growth of non-motorised transport such as cycling and walking while providing easy access to linkages with public transport.

Simon Ratcliffe explores some of the challenges cities are likely to face as a result of changes to the climate.