Carbon pricing and planetary boundaries.

Area of Science:

• Earth System Science
• Environmental Policy
• Climate Change Economics

Background:

• Human activities are pushing Earth's systems beyond safe operating limits, risking irreversible environmental change.
• Policies targeting single environmental pressures can have unintended negative consequences on other Earth system processes.
• The interconnected effects of carbon pricing on multiple planetary boundaries are not well understood.

Purpose of the Study:

• To investigate the global environmental impacts of carbon pricing beyond its direct effect on carbon emissions.
• To assess the potential policy spillovers of carbon pricing on various Earth system processes.
• To evaluate the effectiveness of carbon pricing in addressing multiple planetary boundary pressures.

Main Methods:

• Global environmental and economic modeling to simulate the effects of carbon pricing.
• Analysis of policy spillovers across different planetary boundaries.
• Scenario analysis incorporating carbon pricing and biofuel policies.

Main Results:

• Global carbon pricing can alleviate pressures on several planetary boundaries, strengthening the case for its implementation.
• Carbon pricing may exacerbate certain pressures, notably through increased biofuel production.
• Integrating carbon pricing with biofuel policies can mitigate all assessed planetary pressures.

Conclusions:

• Carbon pricing offers a powerful tool for managing Earth system risks in a multi-boundary context.
• Policy design must account for potential negative spillovers, such as those related to biofuel production.
• A holistic policy approach, combining carbon pricing with complementary measures like biofuel policies, is crucial for safeguarding planetary boundaries.