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The answer here is easy.  Dirty, smokey air.  More than 2 million people die annually from the effects of indoor cooking fires.  Another two million people die annually from other…

Species extinctions are tightly linked to loss of habitat and the conversion of forests, marshes, grasslands and other natural habitats  to agriculture - much of unsustainable and almost all of…

In a balanced system, essentially never.  You will need to add water to replace water lost to evaporation or transpiration (water lost by the plants as they grow) but the…

The best thing about aquaponics is that there is literally no size criteria.  You can do aquaponics on a tiny scale with a betta fish or a couple of guppies. …

The aquaponic system must have enough fish or other aquatic life to produce sufficient nutrients for the plants.  This ideal "bio-load" is always in flux and will vary depending on…

Cloudy water is usually caused by a bacteria bloom from overfeeding, overcrowding, or adding fish too quickly.  It is important to provide enough food without overfeeding the fish.  Most fish…

There is a huge variety depending on your end goal.  First, they pretty much need to be freshwater unless you are growing kelp or saltwater algae.  Then you have to…

Growth rate of your fish will depend on a lot of variables including the type of fish. crowding, quality of food, water quality and water temperature to name a few. …

Aquaponics is a great way to get organic vegetables. It is fun to know the farmer too.  Vegetables you grow just taste better.  They reduce your carbon footprint.  Using aquaponics…

There are a variety of DIY kits and instructions online.  You might take a look at http://www.youtube.com/watch?v=Ap-twxpof6w for a great way to build a modestly-sized inexpensive outdoor system. For a…