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" Manufacturing the cement that binds typical concrete causes about 5 percent of global CO2 emissions. Integrity Block, which makes a structurally sound concrete replacement, shaves that figure by using 40 percent less cement in its rammed-earth masonry. Up to half of each block is composed of quarry scraps. &amp;quot;Quarries are typically after a particular mineral,&amp;quot; says Shawn Cunningham, the company&amp;#039;s vice-president of marketing. &amp;quot;Everything else gets poured out.&amp;quot; As for looks: &amp;quot;When you stack them against a concrete equivalent, there&amp;#039;s no comparison,&amp;quot; Cunningham says. After using these red Sedona landscape blocks, we tend to agree.  RELATED STORIES * PLUS: 10 Weekend Projects to Make Your Home Smarter  * EARLIER: Rain Water Collection Barrels Make for a Smarter Home  * ALSO: Why Porous Pavement Is Right for Your Yard Now  * LIVE GREEN: The News on Solar, Water, CFLs &amp;amp;amp; Recycling   (Photograph by Studio D) "^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.popularmechanics.com/home/how-to/a12362/4313375/>