World Habitat Day 2011 was held on 3 October 2011, under the theme – Cities and Climate Change. The United Nations chose the theme Cities and Climate Change was chosen because climate change is fast becoming the preeminent development challenge of the 21st century. Indeed, no-one today can really foresee the predicament in which a town or city will find itself in 10, 20 or 30 years time. In this new urban era with most of humanity now living in towns and cities, we must bear in mind that the greatest impacts of disasters resulting from climate change begin and end in cities. Cities too have a great influence on climate change.
The main celebration was held in Aguascalientes, Mexico.