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What is net zero?
- Over 50 countries, major corporations (e.g., British Airways, Facebook), and artists have pledged to reach net zero emissions.
- The Paris Agreement commits signatories to balancing greenhouse gas emissions and removals in the second half of the 21st century.
- The world's current economy emits approximately 40 billion tonnes of CO2 annually.
- Achieving net zero requires a dual approach: drastically cutting emissions and actively removing greenhouse gases via "negative emissions."
- Negative emissions are necessary because cutting emissions alone is insufficient to meet temperature targets in hard-to-abate sectors like aviation and manufacturing.
- Current negative emission methods include planting forests and improving soil carbon storage, which are already in use at scale.
- Emerging technologies include direct air capture and bioenergy with carbon capture and storage (BECCS), but none are yet proven at scale.
- Reliance on unproven negative emission technologies creates significant risk; current innovation levels may arrive too late to compensate for delayed emission cuts.
- There is a strategic tension where governments and industries may delay emission reductions by betting on future, cheaper negative emission technologies.
- Delayed action risks allowing polluters to exceed necessary limits under the guise of future compensation.
- Disputes over accountability hinder progress; carbon-intensive emerging markets (e.g., India, China) argue that consuming nations or historic emitters should bear the burden of negative emissions.
- No universal policy currently exists for accounting and attributing specific greenhouse gas molecules to specific entities.
- Government net zero pledges now cover over two-thirds of the global economy.
- The US and EU aim for net zero by 2050.
- China, the world's largest current emitter, has pledged carbon neutrality before 2060.
- Setting targets provides direction for policy and investment but does not guarantee achievement.
- Most existing government policies prioritize emission reductions over the development and scaling of negative emissions plans.
- Achieving net zero is described as a "Herculean" task requiring global economic, governmental, and individual participation beyond a mere technological revolution.