Water delivery is the responsibility of the government. Thirty years ago many parts of Delhi received drinking water much of the time. Today no area receives water round the clock and worse, the water delivered is contaminated. In common with cities in many developing countries, industrialisation, rapid urbanisation and growing population estimated to be around 16 million, caused in part by migration from rural areas, have put pressure on Delhi's water resources. An increased demand for water and falling ground-water levels have only intensified this pressure.

Humanity has just crossed a major landmark in its history with the majority of people now living in cities. Cities have long been known to be society's predominant engine of innovation and wealth creation, yet they are also its main source of crime, pollution, and disease. The inexorable trend toward urbanization worldwide presents an urgent challenge for developing a predictive, quantitative theory of urban organization and sustainable development.

The relationship between climate change and cities is complex. City-based activities contribute significant amounts of greenhouse gases and, simultaneously, are often more vulnerable to the impacts of climate change. Dhaka is now the world's eighth largest city and a significant proportion of Bangladesh's greenhouse gases are generated there although, relative to total emissions worldwide, the contribution is negligible.

In this paper we illustrate the socio-economic dynamics of peri-urban zones of Indian Metropolitan cities, which are at the heart of the current urban liberalisation. For this, we study the impact of the water purchasing agreement the Metropolitan water board signed with some farmers of peri-urban areas of Chennai (formerly Madras).

Using the 1994 Bolivian Integrated Household Survey, this study analyzes the equity implications of urban water sector reform including both increased water prices and increased access to piped water. Household water expenditures are examined by income decile, and low-income households are found to spend a higher percentage of income on water than high-income households.

Definitions and indicators play an important role in determining success. In the context of the Millennium Development Goals, the global target of reducing the proportion of population without access to improved sources of water is expected to be met. A major contributor to success is India, where the proportion of population with access to water has increased from 68% in 1990 to 86% in 2002.

Human-induced modifications on land and water are posing a serious threat to geo-environment in general and groundwater regime in particular along the fringe areas of most cities in the world.