Question of the Week: Low-tech solutions

Composting is a low-tech solution to a problem caused by high-tech practices.

The use of vermiculture technology to deal with heavy-metal poisoning is an example of how natural, self-sustaining solutions could help resolve some of today's biggest environmental challenges.

Question: Do you have any other examples of low-tech environmental solutions? E-mail us at ecosolutions@cnn.com E-mail to a friend