Definitions - m


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The region around the earth in which the earth's magnetic field plays a dominant part in controlling the physical processes that take place.

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Mammatus Clouds

Clouds that look like pouches hanging from the underside of a cloud.

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Mandatory Recycling

Programs which by law require consumers to separate trash so that some or all recyclable materials are recovered for recycling rather than going to landfills.

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Mauna Loa

A volcano on the island of Hawaii where scientists have maintained the longest continuous collection of reliable daily atmospheric records.

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Mean Radiant Temperature

The average temperature experienced from the combination of all the surface temperatures in a room, i.e walls, floors, ceilings, furniture, and people.

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The scale of meteorological phenomena that ranges in size from a few km to about 100 km. It includes local winds, thunderstorms, and tornadoes.

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Methyl Bromide

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Metropolitan Coalescence

The merging of the urbanized areas of separate metropolitan regions; Megalopolis is an example of this process.

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Micro Inverter

This is a small Inverter that mounts on to the back of each solar panel instead of having one large Inverter used by all the panels. While it works better when partial shading is a concern, it can increase the cost of the overall system.

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Micro Wind Turbine

Micro wind turbine is an umbrella term for small scale wind turbines that are typically deployed on or near buildings and used to generate electricity that is transmitted direct to the property.

Micro wind turbines have in the past been criticized for being visually intrusive and generating less energy than expected.

However, suppliers maintain that models can generate up to 100Kw of energy and represent an efficient source of on-site renewable energy as long as they are situated correctly.

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A strong localized downdraft less than 4 km wide that occurs beneath severe thunderstorms. A strong downdraft greater than 4 km across is called a down burst.

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A microgrid is a group of interconnected loads and distributed energy resources within clearly defined electrical boundaries that to the grid act as a single controllable entity. A microgrid can connect and disconnect from the grid to allow it to operate in both grid-connected or island-mode.

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Midnight Zone

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Modal is 100% biodegradable and can make a great eco alternative to viscose. It's made from beech trees in Australia and needs few fertilizers or pesticides.

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A coating or discoloration caused by various saprotrophic fungi that develop in a damp atmosphere on the surface of stored food, fabrics, wallpaper, etc.

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Click on a letter to see all the terms and definitions that begin with that letter.

A free Android app containing all these definitions is now available, called the Green Dictionary. Click here to see the entry on the Android market; or click here if on an Android phone.