The Crucial Years
The Crucial Years

The Crucial Years

by Bill McKibben

Twice Weekly Freemium

Climate insights from the founder of 350.org. Bill McKibben's twice-weekly Substack covers the most important climate stories, including ones the mainstream press misses.

About The Crucial Years

The Crucial Years is Bill McKibben's Substack newsletter, offering twice-weekly insights on climate change from one of the movement's most important voices. McKibben covers stories the mainstream press misses while providing context from decades of climate work. As the founder of 350.org and author of seminal climate books, McKibben brings unmatched perspective to climate journalism.

What Makes This Newsletter Unique

Bill McKibben brings over 30 years of climate activism and writing to every issue. His ability to see the big picture while surfacing lesser-known stories makes The Crucial Years invaluable. The newsletter connects readers to the climate movement, not just climate news.

Who Should Subscribe?

The Crucial Years is ideal for: - Climate activists and organizers - Environmentalists seeking perspective - Policy makers tracking climate action - Educators teaching about climate - Anyone committed to climate action If you want climate insight from a movement leader, subscribe.

Content Format

Twice-weekly editions include: - Analysis of climate developments - Stories the press misses - Movement updates and actions - Historical perspective - Calls to action

Recent Newsletter Issues

View all archived issues
Feb 2, 2026

Thinking about lying

Climate denial taught our leaders shamelessness

Jan 27, 2026

Time for some courage in the climate fight too

Big business, and its political enablers, have turned tail. They need to take a page from the resistance

Jan 22, 2026

We interrupt the madness for a note from the rational world

And an encouraging one, at that!

Pricing & Subscription Options

Free + Premium

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  • Free tier with core content
  • Premium tier with extra features
  • Unsubscribe anytime

Free issues available, paid subscription for full access

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Our Take: Pros & Cons

Pros

  • 30+ years of climate expertise
  • Movement leader perspective
  • Twice-weekly updates
  • Deep historical context
  • Actionable content
  • Stories others miss

Cons

  • Advocacy perspective
  • Can be urgent in tone
  • Full access requires payment
  • US movement focus

Frequently Asked Questions

Is The Crucial Years free?

Some issues are free, with full access requiring a paid Substack subscription.

Who is Bill McKibben?

Bill McKibben is a climate author, activist, and founder of 350.org. He wrote 'The End of Nature' in 1989.

How often does Bill McKibben publish?

The Crucial Years publishes twice weekly.

What makes this different from other climate newsletters?

McKibben's 30+ years of climate activism gives unique perspective, and he often covers stories mainstream press misses.

About the Author: Bill McKibben

B

Bill McKibben

Bill McKibben is an author, environmentalist, and founder of 350.org. He wrote 'The End of Nature' in 1989, one of the first books about climate change for general audiences. McKibben has been a leading voice in the climate movement for over three decades.

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