Plan B for the planet

Not too long ago, the idea of cooling Earth by bouncing sunlight back into space would have seemed like a fringe fantasy — equal parts sci-fi and geopolitical taboo.

- KUMAR ABISHEK

These days, it's inching into the heart of serious climate conversations.

This is no coincidence. Climate forecasts, once laden with caveats, are now sounding more like sirens. The World Meteorological Organization has warned that global temperatures could rise as much as 2°C above pre-industrial levels in the next five years, breaching a climate red line. At that mark, we're looking at shrinking crop yields, collapsing ecosystems, and more than a third of the global population potentially exposed to extreme heat.

In this climate of urgency, Solar Radiation Modification (SRM), a subfield of solar geoengineering, is garnering attention. The concept is simple: Reflect a small portion of sunlight back into space to artificially cool the planet. The methods vary wildly — from injecting sulphur dioxide into the stratosphere to spreading reflective glass particles over Arctic ice. Elegant in theory but risky in practice. Tinker with the global thermostat to cool one region, and you might cause drought in another. The models are incomplete, risks planetary, and governance nearly absent.