Folks check out this paradox

Cooling From The Sun: SunChiller

The SunChiller provides air cooling as a primary output, with space and water heating also possible. The system uses vacuum-tube heat-pipe solar thermal collectors to heat water, which drives an absorption chiller to provide cooling. Water serves as the "refrigerant," avoiding the use of ozone-depleting compounds.

compost toilet

 COMPOSTING TOILETS

 Composting toilets have been popular in Scandinavia for some time; at least twenty-one different composting toilets were on the market in Norway alone in 1975.One of the most popular types of commercially available composting toilets in the United States today is the multrum toilet, invented by a Swedish engineer and first put into production in 1964 (see Figure 6.4). Fecal material and urine are deposited together into a single chamber with a double bottom.

Rammed earth construction

Rammed Earth Construction

Rammed Earth Construction is the ultimate in building with local materials.  It is build from earth that is dug up from the building site.  The technique consists of building a form, similar to a form used to pour concrete, and then filling the form with a mixture of sand, clay and gravel with portland cement as a binder and then compressing it together with a tamper.

INVERTER CHARGERS DO'S AND DONT'S

ABOUT INVERTER CHARGERS A fairly comprehensive summary about inverter chargers i.e uses & how to use them.