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Green Glossary

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R-value
When it comes to keeping out the heat, one window-or one type of insulation or building material-is... more
 
Radiant barrier
This is a reflective material that is used to block heat from entering a building. A layer of... more
 
Radiant heat
If you're the type who gets cold feet, your toes will love this. It's a network of pipes beneath... more
 
Radiation
This is the transfer of energy via waves or particles. An example is when heat moves from a warmer... more
 
Radon
An invisible threat in many homes, this colorless, odorless, radioactive gas, radon is produced... more
 
Rainwater harvesting
Here's a good rainy-day project: Collecting water-from a roof, driveway, or other hard surface... more
 
Reclaimed material
Have you ever seen a beautiful old door in an all but forgotten building and wanted to rescue it?... more
 
Recycled plastic lumber
A house made out of soda bottles and milk jugs may sound like a third-grade art project, but those... more
 
Recycling
This is the process of taking materials that would be tossed away, most likely ending up in... more
 
Renewable energy
A supply of energy that won't run out, at least not as long as humans are on Earth to put it to... more
 
Renewable resource
This is the holy grail of conservationists: Any material that can be quickly regrown or replenished... more
 
Renewables
This is the holy grail of conservationists: Any material that can be quickly regrown or replenished... more
 
Retrofit
This is not about snug bell-bottoms. Retrofit is a term that refers to taking an existing... more
 
Runoff
This is one source of pollutants in the water supply. The term refers to rainwater or irrigation... more
 

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Quiz of the Day
    Q: Should You Forgo Organic Produce Packaged in Plastic?

Question: Organic fruits and vegetables are often packaged in plastic containers. Non-organic produce is displayed loose in a bin, and could be toted away in a reusable produce bag. Which apple should you pick to serve the environment?

Green Tip of the Day
   Choose a Dark-Colored Computer Background

The way your computer monitor looks makes a difference. Conventional computer monitors...

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Word of the Day
   Polyethylene

This lightweight, translucent, and flexible plastic is used for grocery bags, food containers, household-cleaner bottles, house wrap products, and much more. It is one of the most common-and least toxic-petroleum-based plastics. There are high- and low-density polyethylene varieties; these are labeled numbers 2 and 4, respectively, inside the triangular recycling symbol. For more on plastic, click here.
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How to Guides
   How to Reduce Your Junk Mail and Paper Waste

Many catalogs that arrive in people's mailboxes across the nation end up going straight to the...

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