Show HN: TerraShift: What does +2°C (or -20°C) look like on Earth?

I built an interactive 3D globe to visualize climate change. Drag a temperature slider from -40°C to +40°C, set a timeframe (10 to 10,000 years), and watch sea levels rise, ice sheets melt, vegetation shift, and coastlines flood... per-pixel from real elevation and satellite data.

Click anywhere on the globe to see projected snowfall changes for that location.

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I'm an amateur weather nerd who spends a lot of time on caltopo.com and windy.com tracking snow/ice conditions. I wanted to build something fun to imagine where I could go ski during an ice age.

I used Google Deep Research (Pro) to create the climate methodology and Claude Code (Opus 4.6 - High) to create the site.

The code: https://github.com/travistruett/terrashift

The models aren't proper climate simulations, they're simplified approximations tuned for "does this look right?" but more nuanced than I expected them to be. The full methodology is documented here if anyone wants to poke holes in it.

https://github.com/travistruett/terrashift/blob/main/docs/al...