The Diary of a CEOIan Bremmer: Why America became the world's biggest risk
Through tariff chaos, U.S. policy now outpaces China as the world's main risk source; shifting commitments pull the order toward a g-zero era.
At a glance
WHAT IT’S REALLY ABOUT
Global power vacuum grows as US retreats, China rises, AI disrupts
- Bremmer argues the United States has become the world’s biggest source of geopolitical uncertainty as it rejects the rules and leadership role it previously built.
- He describes a Middle East escalation—centered on Iran, the Strait of Hormuz, and spillover conflict in Lebanon—as a case study in how impulsive U.S. decision-making can trigger systemic global economic shocks.
- He warns China’s decades-long strategy to control critical minerals, EV/battery supply chains, and technology standards positions it to set global rules even without overt military dominance.
- He frames advanced AI as an underappreciated systemic risk, citing models capable of rapidly finding exploitable software vulnerabilities that could destabilize banks and critical infrastructure.
- He proposes a pragmatic path to “utopia” that depends on new governance: AI arms-control with China, an AI “stability board,” and broad access programs so AI benefits don’t concentrate into a destabilizing techno-oligarchy.
IDEAS WORTH REMEMBERING
5 ideasThe biggest geopolitical risk is now U.S. unpredictability, not a rival superpower.
Bremmer’s core claim is that Washington is actively dismantling the trade, security, and alliance norms it created, producing outsized global spillovers because even “small” U.S. shifts move markets and security calculations everywhere.
The world is drifting toward a “G-Zero” power vacuum.
If the U.S. won’t lead and no other actor can replace it, rule-making becomes fragmented and coercive—strong states and powerful firms set terms while weaker actors adapt, raising baseline instability.
Iran’s leverage is less about nukes and more about the Strait of Hormuz.
He argues Iran can’t “win” conventionally but can impose global economic pain via shipping disruption/tolls, which creates bargaining power and complicates any clean U.S. exit or decisive military solution.
Trump’s impulsiveness plus loyalty-first staffing increases tail risks.
Bremmer contrasts Trump’s first term (more internal constraints) with a second-term environment where advisers prioritize loyalty, reducing friction against high-risk moves and amplifying strategic miscalculation.
A plausible off-ramp is nuclear compromise in exchange for strait-related concessions.
He predicts extended ceasefires and continued talks could yield partial Iranian concessions on enrichment if Iran retains a privileged, revenue-generating position over transit—paired with European/Indian escorting to stabilize shipping.
WORDS WORTH SAVING
5 quotesThe US has become the biggest driver of geopolitical uncertainty in the world.
— Ian Bremmer
If the Americans are no longer willing to act as the global leader, but no one else is capable of filling those shoes… you have a G Zero.
— Ian Bremmer
They created a model which is so powerful that they couldn't release it because it would've been an immediate systemic risk to the global economy and our security.
— Ian Bremmer
The biggest danger to the United States is not China. It's America.
— Ian Bremmer
I’m not worried about artificial general intelligence. I’m worried about human beings becoming more computer-like.
— Ian Bremmer
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