Waste-to-Energy - Burning of waste to generate steam, heat or electricity.

Water Conservation - Refers to reducing the usage of water and recycling of waste water for different purposes like cleaning, manufacturing, agriculture etc.

Waterless urinals - use no water, but instead replaces the water flush with a specially designed trap that contains a layer of buoyant liquid that floats above the urine layer, blocking sewer gas and urine odors from the room.

WEEE – Waste Electrical and Electronic Equipment, your broken or not wanted electronic gadgets like mobile phones or computers.

Wind Power – Energy derived from the wind.

Wind Turbine - A rotating machine that converts the kinetic energy of wind into mechanical energy. If the mechanical energy is used directly by machinery, such as pumping water, cutting lumber or grinding stones, the machine is called a windmill. If the mechanical energy is instead converted to electricity, the machine is called a wind generator , wind turbine , wind power unit (WPU) , wind energy converter (WEC) , or aero generator .