30 Years Later—The Montreal Protocol as Essential as Ever

At least this story is about what might have been if we hadn't passed environmental regulations, instead of what will happen if we don't.

1 minute read

September 27, 2017, 8:00 AM PDT

By James Brasuell @CasualBrasuell


Ozone Layer

molekuul_be / Shutterstock

The Montreal Protocol turned 30 years old this month. According to Stephen Leahy, the international agreement is "a landmark environmental success that serves as a model for addressing other problems.

According to Leahy:

The Earth’s ozone layer would have collapsed by 2050 with catastrophic consequences without the Montreal Protocol, studies have shown. In the world we avoided thanks to the Protocol the UV Index measure during a Washington, DC or Los Angles mid-summer day would be at least 30 by 2070. Anything over 11 is considered extreme. There would have been an additional 280 million cases [pdf] of skin cancer, 1.5 million skin cancer deaths, and 45 million cataracts in the United States, according to the U.S. EPA.

There's a lot more scary data than just the preceding included in the article before the article turns to lessons of the politics that allowed the international agreement to proceed. The not-so-subtle subtext is the efforts of the fossil fuel industry to suppress and resist climate change legislation today.

Finally, the article notes that the Montreal Protocol still has unfinished business, and threats (i.e., the Trump Administration) to the ongoing process that protects the planet from ozone-damaging chemicals.

Monday, September 25, 2017 in National Geographic

Young Professional

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 and Environmental 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 and Environmental Planner

Get top-rated, practical training for planners

"Planetizen federal action tracker" logo superimposed over black and white image of US Capitol dome.

Planetizen Federal Action Tracker

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

September 16, 2026 - Zachary Whalen

Overlapping highways

The state-sanctioned urbicide of Austin

People don’t kill cities. Freeways do.

September 8, 2026 - Benjamin Schneider

The Hoover Dam blocking the Colorado River. The river's water level is noticeably low. The cliffs surrounding the blue water are brown and jagged.

US to reduce Colorado River water deliveries to Mexico

A new Colorado Treaty amendment reduces Mexico’s Colorado River water allocation by 250,000 acre feet.

September 11, 2026 - The Arizona Republic

A coal power plant in Iowa billows smoke into the air.

Nation's most wind-powered state turns to coal as data centers increase energy demand

For the first time in decades, Iowa has increased its generation of coal power.

3 hours ago - Inside Climate News

A sign on a fence describing the rain garden behind it.

NYC cools commuters with city's first rain garden above a bus stop

New York City officials say the plants in the rain garden can absorb 16 gallons of rainwater during heavy storms.

4 hours ago - Gothamist

A map showing Brightline West's intended route from  Las Vegas to Rancho Cucamonga, California.

Brightline West’s future may rely on $6 billion federal loan

The company has until Nov. 2 to make a $400 million equity investment into its proposed high-speed rail line.

5 hours ago - Smart Cities Dive

FREE Course: Walkable City 1: Why Walkability?

After describing his path towards focusing on walkability as the essence of good planning, Jeff Speck marches through his five principal reasons for making more walkable places.

Reinventing Malls: Planning Alchemy—Turning Gray Fields Into Gold

The course focuses on the opportunities and imperatives that shape reinvention of mall sites.