Why Overshoot and Return Won’t Save Us: The Perils of Climate Science’s Time Machine Fantasy

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In this thought-provoking article, researchers argue that mainstream climate science’s reliance on “overshoot scenarios” has led to unrealistic expectations about reversing global warming. The concept of temporarily exceeding climate targets, only to later dial them back using carbon removal, has become a dangerous norm. The authors argue that the feasibility of large-scale carbon removal is highly questionable and that overshoot scenarios delay meaningful climate action. True climate mitigation requires immediate emission reductions and an end to the illusion that we can safely exceed critical temperature thresholds.

Key Points

• Many climate models involve temporary overshoot of the 1.5°C target, relying on future carbon removal.
• Large-scale carbon removal is challenging, requiring massive land use and energy, making it an unreliable solution.
• Climate impacts experienced during an overshoot period may be irreversible, regardless of later temperature reductions.
• True mitigation requires immediate reduction of emissions and systemic changes that address fossil fuel dependency.
• Relying on overshoot scenarios waters down climate targets and delays effective policy action.

Summary

The concept of overshooting climate targets and later reversing them has been endorsed by mainstream climate science, but researchers argue that it is an unrealistic and risky strategy. Achieving true climate mitigation requires immediate action, drastic emission cuts, and confronting fossil fuel interests to avoid surpassing critical temperature limits that could lead to irreversible damage.

Based on an article published in The Conversation.