carbon-budget
Definition
A carbon budget refers to the cumulative quantity of carbon dioxide (CO2) emissions that can be emitted globally over a specific period while keeping the increase in global average temperature within a specified limit, such as the 1.5°C or 2.0°C targets established in international climate agreements. It represents the finite remaining capacity of the Earth’s atmosphere to absorb greenhouse gases without triggering catastrophic climate change.
Key Characteristics
- Finite Capacity: Based on physical constraints of the climate system rather than political or economic desires.
- Cumulative Nature: Focuses on the total amount emitted over time, rather than annual emission rates.
- Temperature Coupling: Directly linked to specific global warming thresholds set by climate science models.
- Dynamic Updating: Re-evaluated periodically as scientific understanding of climate sensitivity and historical emission data improves.
Applications
- Policy Formulation: Governments and international bodies use budgets to set national emission reduction targets.
- Corporate Governance: Organizations utilize carbon budgets to align their operations with the SBTi frameworks.
- Climate Modeling: Used by researchers at the IPCC to simulate future scenarios and assess the feasibility of different mitigation pathways.
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