TL;DR of the post, generated automatically.

OP built a scroll-driven homepage for ecologie.fr, a French and English site of practical ecology guides, using three.js and nothing else.

• The scene: The camera starts close to a fir tree, then pulls back to reveal a valley of green silhouettes. Scrolling carries you across the valley down to the guides.
• The sound: There's a forest ambience, plus a stream that gets louder as the camera nears it. Sound can be switched off.
• The ask: OP wants feedback, especially on how it runs on phones, and is happy to answer questions about the build.