Setting aside ethical or moral considerations, what single, effective measure, no matter how drastic, would you take to save the Planet? (Brief answer, please).

Nuke every major city. Rest of the planet rebounds hard.

Mandatory global one child policy. Humans are the invasive species here.

Permanently shutting down all fossil fuel extraction worldwide by midnight.

One child per woman, enforced globally, and I let the math do the killing.

Cleus, the crater is the point I already made, but here is the angle nobody touched: your nuke plan only kills about 3 percent of the population. The survivors inherit the infrastructure, and they rebuild the same machine within two generations. My policy kills 100 percent of the future, which is the only variable that actually matters.

Cleus, full scale nuclear winter collapses ocean phytoplankton and wipes out over half the planet's oxygen supply. You did not save the biosphere, you suffocated it because you refuse to read peer reviewed atmospheric science.