Of all the water used by humans for growing food, about 65 percent is consumed by green water use (for growing food in about 1.13 billion hectares of rainfed croplands of the World from direct rain and soil moisture from unsaturated zone) and the rest 35 percent is consumed by blue water use (for growing food in about 400 million hectares of irrigated croplands of the World obtained from reservoirs,  
Figure 1: **Green revolution (productivity per unit of land). ** Some of the major factors that helped achieve green revolution (years: 1955–2005) are illustrated. These factors included: (A) swift rise in yield per unit of land (e.g., through better land management, introduction of high-fast yield varieties, fertilizer, nutrients, and herbicides), (B) crop intensification (e.g., double and triple crop per year), (C) massive investments in irrigation, and (D) increase in cropland areas. barrages, lakes, rivers, and deep aquifer groundwater). But such heavy water use for food production is no more tenable due to increasing pressure for alternative water use such as for increasing urbanization, industrialization, environmental flows, bio-fuels, and recreation. This has brought to sharp focus the need to grow more food per drop of water (or more crop per drop) leading to a \"blue revolution\" (see Figure 2). These imperatives make us to focus on producing more food in coming decades and in the present century from: (a) existing cropland areas, and (b) existing water allocations. Indeed, even better will be to focus on ideas that will focus on producing more and more food from less and less croplands and less and less water allocations- thus helping us to truly move towards an \"ever green revolution\" that combines the \"best of green revolution\" (a second green revolution) and a \"blue revolution\" (Figure 1 and Figure 2). **Figure 2. Blue revolution (productivity per unit of water). ** A blue revolution must, in the least, should include: (A) creating \"water banks\" (e.g., store massive floods in certain years such as the great Indus river floods of the year 2010 as \"water banks\" in thousands of lakes for use during lean years and develop effective water distribution system for distribute this water during drought years), (B) increasing water use efficiency (e.g., of major and minor irrigation systems), (C) advancing water management (e.g., \"green water use\"--water in soil moisture and by direct rain and \"blue water use\"--water in lakes, rivers, reservoirs, and deep aquifers management), and (D) increasing crop water productivity (e.g., crop per drop). The need for addressing World's food security in coming decades and the present century is critical and urgent. However, for this to happen, one of the primary requirements will be to have an advanced geospatial information system. Such a system should be global, consistent across nations and regions, and in the least, provide such critical information as: (a) crop types, (b) precise location of crops, (c) cropping intensities (e.g., single crop, double crop), (d) cropping calendar, (e) crop healthvigor, (f) watering methods (e.g., irrigated, supplemental irrigated, rainfed), (g) flood and drought information, (h) water use assessments, and (g) yield or productivity (expressed per unit of land and)or unit of water). Opportunities to set-up such a global system is best achieved using fusion of advanced remote sensing (e.g., fusion of Landsat, Resourcesat, MODIS) in combination with national statistics, ancillary data (e.g., elevation, precipitation, temperature), and field-plot data. But such a system, at global level, will be complex in data handling and processing and requires coordination of with multiple agencies leading to development of a seamless, scalable, and repeatable methodology. There is substantial progress in this effort in last few years [1-7].