A controllable cloud of micro-particles positioned at the Sun–Earth L1 point. It trims a small fraction of incoming sunlight before it reaches Earth, acting like a global dimmer—quiet, precise, and out in deep space.

From the ground, the cloud’s apparent size is tiny and bathed in sunlight; it doesn’t create a visible blot or change the night sky. Operations occur 1.5 million km away, so daily life and astronomy remain undisturbed.

L1 sits directly on the Sun-Earth line. A cloud there reduces solar energy upstream of the planet, giving maximum leverage with minimal material—no seasons or eclipses to interrupt coverage.

Globally averaged, 2% equals about ~7 W/m² less energy at the top of the atmosphere—enough to counter a large share of recent warming when adjusted carefully. The system is dialable anywhere from 0–2%.

We modulate density, size, and particle mix to tune opacity in real time. Thicken during heat waves, ease off in winter, or create temporary “windows” for observatories and grid needs.

If we pause injections, natural forces disperse the cloud. We can clear most of it in hours to days and fully stand down on short timelines—avoiding “lock-in” risks and enabling cautious, stepwise operation.

The cloud primarily scatters/reflects sunlight in space. Nothing is added to the atmosphere or oceans, and the sky at night doesn’t change. It’s climate action with the fewest terrestrial side effects.

Start with a km-scale demo, validate control and monitoring, then expand modular stations as performance is proven. Sourcing material from the Moon reduces costs and enables sustained, responsible operation.