The AI Decay: 20 Billion Synthetic Pages Polluting Our Brains

AI has a dirty secret: The more it learns from itself, the dumber it gets.

Researchers led by Ilia Shumailov discovered a phenomenon called “model collapse” – which is what causes AI models that are trained on AI-generated content to gradually “mis-perceive reality.” As a result, artificial intelligence loses the nuances that make human intelligence valuable.

Their study in the journal Nature found that models trained on recursively generated data forget the true underlying distribution of real-world information. Over time, performance degrades in ways that are nearly impossible to detect until significant damage is done.

Like Breathing Car Exhaust

Car exhaust is a byproduct of combustion that lacks the oxygen needed to sustain life. Similarly, synthetic data lacks the “oxygen” of genuine human experience – the unpredictable edge cases, cultural nuances, and rare but meaningful outliers that exist in real-world data.

So, when AI trains on other AI’s outputs, it’s essentially suffocating human intelligence on its own exhaust.

The scale of this problem is alarming: Research firm Graphite found that, by November 2024, AI-generated articles had surpassed human-written content on the web. Since ChatGPT’s launch in late 2022, more than 10 billion AI-generated pages have been published. With over 400 million pages per month, we can assume over 20 billion pages as of December 2025 – a tsunami of synthetic content now polluting the very training databases that future AI models depend on. It is fair to say that the contamination rate today is well over 60%.

Elon Musk acknowledged this crisis in January 2025, stating that “the cumulative sum of human knowledge has been exhausted in AI training. That happened basically last year.” His proposed solution? Superintelligence – which will never happen if we’re destroying the training data needed to build artificial general intelligence (AGI).

Because everyone else will be training their AI on synthetic garbage that’s training on synthetic garbage that’s training on synthetic garbage.

Words generated by AI impact our view of the world. Images generated by AI have a deeper impact on how we see reality. A new study led by Elizabeth Loftus shows that AI-altered visuals can implant false memories with alarming ease. Researchers exposed 200 people to four types of media: original images, AI-edited images, AI-generated videos, and AI-generated videos based on edited images. The AI-generated video condition produced roughly double the number of false memories compared to unaltered images, and people felt about 19% more confident in those false memories. The consequence is profound: AI can now manufacture synthetic memories that feel real, influence beliefs, shape identity, and potentially sway juries, voters, customers, and public opinion. As hyper-realistic media becomes ubiquitous, the line between experience and simulation blurs, making society more vulnerable to manipulation, misinformation, and psychological coercion.

Here’s why sales leaders should care: If your enablement library is filled with AI-generated call scripts, AI-written objection handlers, and AI-created coaching scenarios, you’re building an echo chamber of mediocrity.

Your team isn’t learning from the messy, unpredictable reality of actual customer conversations – they’re learning from sanitized, synthetic approximations that have already lost critical nuance.

Guard your human data like gold. Real sales calls. Real objections. Real wins and real losses. The specific moment a prospect’s tone changed. The unexpected question that required creative thinking.

That’s the oxygen AI can’t synthesize. Don’t let your sales training breathe its own exhaust.

In a world where everyone has access to the same AI tools, your competitive advantage isn’t the technology – it’s the authentic human data you feed it. The companies that preserve their human-generated sales data today will have an insurmountable advantage.

Gerhard Gschwandtner is the Founder and CEO of Selling Power.