Exceeding the planet's carrying capacity (as above) is a sufficiently credible and immediate existential risk to take seriously (but perhaps still is not as credible nor as immediate as other existential risks). However, there are no known interventions at this time to reliably improve our planet's carrying capacity.

Though I fear it hypocritical to mention: perhaps you ought to give some thought to reducing consumption per individual living human instead? Particularly among those who already enjoy the largesse?