climate-800k-years-context

Why This Matters

For 800,000 years, Earth's climate oscillated naturally between ice ages and warm periods with a predictable rhythm. Modern humans and all of civilization developed during the stable Holocene epoch (last 11,700 years).

What's Different Now:

• Speed: Current warming is ~100x faster than natural ice age transitions
• Direction: Rising during a time when natural cycles suggest slight cooling
• Magnitude: Already +1.4°C above pre-industrial, heading beyond anything in 800,000 years
• Cause: Natural factors (solar, volcanic) can't explain the trend—it's human greenhouse gas emissions

The Natural Pattern We're Breaking:

• Ice ages (~8°C colder): Occurred every ~100,000 years
• Interglacials (~0°C): Warm stable periods lasting 10-20k years
• Transitions: Took 5,000-10,000 years to warm/cool naturally
• Current: Rising 1.4°C in just 150 years (and accelerating)

This isn't just "another warm period"—we're pushing Earth's climate into uncharted territory at a speed that ecosystems and human systems cannot adapt to naturally.