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biofuels made from human waste
Brendan Riley/Flickr/Commercial use & mods allowedhttps://creativecommons.org/licenses/by-sa/2.0/

Crud-to-crude: The global potential of biofuels made from human waste

Creating liquid biofuels from human waste shows promise as a way to meet one of alternative energy’s greatest challenges: reducing the transportation sector’s heavy carbon footprint. The good news is there is a steady supply stream where waste is treated.

startup turns human poop into fertilizer
Lisa Kelly/Flickr

San Francisco startup turns human poop into fertilizer

Epic Cleantec's machines can sanitize globs of sewage for a farm-fresh result.
recycling trees and poop to make compost
GP Witteveen/Flickr

US cities are recycling trees and poop to make compost

Wood and biosolids from water treatment plants can be used to improve the soil—and keep remaining trees healthy.
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