**StackExchange sites**

  - [Gardening SE](http://gardening.stackexchange.com) composting, organic gardening, permaculture
  - [Home Improvement SE](http://diy.stackexchange.com) sustainable construction materials, making your home more sustainable / energy efficient
  - [Personal Finance & Money SE](http://money.stackexchange.com) save money by reducing energy consumption or waste
  - [Seasoned Advice SE](http://cooking.stackexchange.com) organic food, ingredients from sustainable farming
  - [Skeptics SE](http://skeptics.stackexchange.com) various topics (e.g. CFLs, global warming)