Human Waste as a Climate Solution

Using treated waste as an agricultural fertilizer is controversial, but the practice has several climate-related benefits.

1 minute read

November 21, 2019, 11:00 AM PST

By Walker


Compost Field

ImagineStock / Shutterstock

In King County, treated human waste, also known as biosolids, plays an important part in the government’s efforts to combat global warming. “Every year we provide the equivalent of taking about 8,000 cars off the road,” said Cat Gowan, a biosolids project manager in the county’s wastewater treatment division.

King County is far from alone in sending its biosolids to farms; about 55% of all treated human waste in the U.S. is added to soils. But the Seattle-area program, which began in the 1970s, is one of the nation’s most ambitious.

Wednesday, November 20, 2019 in Yale Climate Connections

portrait of professional woman

I love the variety of courses, many practical, and all richly illustrated. They have inspired many ideas that I've applied in practice, and in my own teaching. Mary G., Urban Planner

I love the variety of courses, many practical, and all richly illustrated. They have inspired many ideas that I've applied in practice, and in my own teaching.

Mary G., Urban Planner

Get top-rated, practical training

Wastewater pouring out from a pipe.

Alabama: Trump Terminates Settlements for Black Communities Harmed By Raw Sewage

Trump deemed the landmark civil rights agreement “illegal DEI and environmental justice policy.”

April 13, 2025 - Inside Climate News

High-rise apartment buildings in Waikiki, Hawaii with steep green mountains in background.

Study: Maui’s Plan to Convert Vacation Rentals to Long-Term Housing Could Cause Nearly $1 Billion Economic Loss

The plan would reduce visitor accommodation by 25% resulting in 1,900 jobs lost.

April 6, 2025 - Honolulu Civil Beat

Logo for Planetizen Federal Action Tracker with black and white image of U.S. Capitol with water ripple overlay.

Planetizen Federal Action Tracker

A weekly monitor of how Trump’s orders and actions are impacting planners and planning in America.

April 10, 2025 - Diana Ionescu

A line of white wind turbines surrounded by wheat and soybean fields with a cloudy blue sky in the background.

Wind Energy on the Rise Despite Federal Policy Reversal

The Trump administration is revoking federal support for renewable energy, but demand for new projects continues unabated.

April 15 - Fast Company

Red and white Caltrain train.

Passengers Flock to Caltrain After Electrification

The new electric trains are running faster and more reliably, leading to strong ridership growth on the Bay Area rail system.

April 15 - Office of Governor Gavin Newsom

View up at brick Catholic church towers and modern high-rise buildings.

Texas Churches Rally Behind ‘Yes in God’s Back Yard’ Legislation

Religious leaders want the state to reduce zoning regulations to streamline leasing church-owned land to housing developers.

April 15 - NBC Dallas