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McKinsey & Company analyzed energy use by data centers and found that, on average, they were using only 6 percent to 12 percent of the electricity powering their servers to perform computations. The rest was essentially used to keep servers idling and ready in case of a surge in activity that could slow or crash their operations.

To guard against a power failure, they further rely on banks of generators that emit diesel exhaust.

Even running electricity at full throttle has not been enough to satisfy the industry. In addition to generators, most large data centers contain banks of huge, spinning flywheels or thousands of lead-acid batteries — many of them similar to automobile batteries

In the US this year, there was outrage when people in job interviews and in schools were asked to hand over their Facebook passwords. Dwyer said that in the future and with the arrival of the semantic web and linkable data there is a danger that insurance companies may be able to find out if applicants had done a search for keywords like cancer stretching back 15 years.

Figure 4 illustrates a satellite remote sensing process as applied to agricultural monitoring processes. The sun (A) emits electromagnetic energy (B) to plants (C). A portion of the electromagnetic energy is transmitted through the leaves. The sensor on the satellite detects the reflected energy (D). The data is then transmitted to the ground station (E). The data is analyzed (F) and displayed on field maps (G).

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The data includes passport and National Insurance numbers and bank details. They relate to people who had expressed an interest in, or joined, the Royal Navy, Royal Marines and the RAF.

Aerial maps and GPS-style systems will measure "the distance from each property to a series of amenities and services".

Each of the buildings in the database has a unique identification, and the system can specify the use of around 90pc of buildings in the country – if they are, for example, a newsagents, school, takeaway or office block.

The spokeswoman said the GeoDirectory "provides information on property location and type; and spatially derived data that indicate relative distances of all residential properties from a series of key amenities and services including transport, health, education and emergency services".

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