All of the following are techniques being used to make data centers more "green" except:. a) use of hydropower.
b) air-cooling.
c) use of wind power.
d) use of backup generators.
e) virtualization.

d) use of backup generators.

Explanation:

Going green is a term used for practices that protect the environment by reducing, reusing and recycling resources. It involves engaging in ecologically friendly decisions and lifestyles with a view of preserving natural resources for future generations.

The use of backup generator causes production of green house gases like carbon dioxide. Green house gases erode the ozone layer and increases global warming.

The other options like use of hydropower, air cooling, use of wind power, and virtualisation do not have adverse effect on the environment.

i might look it up later.

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