Welcome to Appropedia

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Sharing knowledge to build rich, sustainable lives.

Appropedia is for collaborative solutions
in sustainability, appropriate technology and poverty reduction.

You are welcome to add to and edit Appropedia -
your site to find, co-create and improve the solutions we need. Our vision and mission.

Contributors have made 298,594 edits and uploaded 23,404 files.
Browse our categories or all 6,451 articles.

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Announcements — more

Windmillprint-crop.jpg Yes it is possible to print a windmill with a 3D printer for a fraction of the cost of manufacturing one conventionaly. Learn more about open-source 3-D printing of open source appropriate technology for sustainable development.


The Geysers in Northern California.
Geothermal power is generated from the high temperatures that can be found in various parts of the earth's crust such as volcanoes, hot springs, and geysers. The water that surrounds and fills the gaps between the rocks in the crust is raised in temperature by these natural processes. This hot water is then pumped to the surface and its steam is captured and used to create electrical power through a turbine system.

There are three common types of geothermal power: dry steam, flash steam, and binary cycle. Dry steam is rare and uses the steam directly from the earth, flash steam pumps the hot water that naturally occurs in the earth to the surface and utilizes its steam, and binary cycle uses a secondary fluid and its vapor to power a generator.

Dry stream geothermal plants use natural steam directly from the Earth. Once the steam pocket is tapped, the steam is channeled directly into a turbine which converts the thermal energy into electrical power. (more types follow)

Solar Charged Lawnmower

Converting a very used gas power lawnmower into a solar charged, low emission, almost silent, lawn cutting machine.

E. F. Schumacher
Perhaps we cannot raise the winds. But each of us can put up the sail, so that when the wind comes we can catch it.

Sharing knowledge to build rich, sustainable lives.
Appropedia is the site for collaborative solutions in sustainability, poverty reduction and international development through the use of sound principles and appropriate technology and the sharing of wisdom and project information. It is a wiki, a type of website which allows anyone to add, remove, or edit content. Registration is encouraged but not required for contributors.

Appropedia has been described as an "appropriate technology wiki," but it is much broader than that - it is a green wiki, and a wiki for all matters of international development and aid. But most importantly, Appropedia is an open site for stakeholders to come together to find, create and improve scalable and adaptable solutions. For more about our motivation, see Appropedia:Mission.

To create a new project page, first browse the project articles and subcategories below for examples and check for possible collaboration opportunities, such as articles similar to what you're considering writing. If you are looking for ideas for your own project, check out our suggested projects. It is highly encouraged to tag your projects with their status -- you can do this with a few templates. Be Bold!

edit  watch  Selected service learning Projects gallery (refresh)

Engr305 Appropriate Technology Projects: Below are selected service learning projects from Engr305 Appropriate Technology, which is a course on appropriate technology at Humboldt State University taught by instructor Lonny Grafman.

Papasan Chair Solar Cooker

A solar cooker and chair when not in use  
Parabolic basket and tin can solar cooker

Solar cooker out of local invasive species and waste materials  
Plastering CCAT Earthbag Terrace

A sturdy, natural plaster covering to the EarthBag gardening terrace being built in front of CCAT  
Rocket stove biomass charcoal

Use of biomass waste charcoal briquettes for rocket stove  
Rowan's portable pedal power generator

A pedal power generator  
Small greenhouse rainwater catchment

A rainwater catchment system for a greenhouse  
Solar Charged Lawnmower

An electric lawnmower that utilizes solar power as an energy source  
Solar heating box

A passive solar heating box  
Sunbrella

An umbrella in the rain, a solar cooker in the Sun  
Sunny Brae Middle School Garden

A garden at Sunny Brae Middle School  
Sunny Brae rainwater catchment system

A residential rainwater catchment system  

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Construction zone — correct mistakes & flag spam as needed

Newest articles more Wanted pages - click to add info more
Under construction
New pages being developed:
  1. The Case for Weaker Patents
  2. Review of low cost synthesis of perovskite solar cells
  3. Differential scanning calorimetry protocol: MOST
  4. Nixtamal
  5. Infanticide
  6. Sustainable transport UK
  7. Washington, D.C.
  8. Review of positive externalities of photovoltaics for the grid
  9. اعلانات مجانية
  10. كشف تسربات

Note: Appropedia's newest pages may not yet comply with our policies. Page titles in italics are "redirects," often created when moving a page.

Under construction

Create a new page:

  1. Animals
  2. Organic waste
  3. Nutrition
  4. Ecosystem
  5. Human development
  6. Clay
  7. Environmental science
  8. Appropriate energy overview
  9. Building management systems
  10. Open sustainability

These red links are invitations for you to contribute your knowledge.

Or create a page on the topic of your choice.

Newest files - images and documents that can be added to pages more

Note: Appropedia's newest files may not yet comply with our policies.

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Please help Appropedia grow!

We want your projects, current works, observations and wisdom! See Contributing content. Improve articles by clicking "edit" at top of the page or section. Our philosophy is: Be Bold and contribute!

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