Discuss the tension between unilateral carbon-pricing mechanisms and the principle of Common But Differentiated Responsibilities (CBDR-RC) in global climate governance.

Unilateral carbon pricing at the border — typified by the EU's Carbon Border Adjustment Mechanism (CBAM), whose definitive phase began on 1 January 2026 [2] — charges imports for their embedded emissions. This collides with the UNFCCC's CBDR-RC principle, which calibrates climate obligations to historical responsibility and national capability [4].

Rationale of unilateral pricing

• Prevents carbon leakage — the shifting of carbon-intensive production to jurisdictions with weaker climate rules [1].
• Covers iron and steel, aluminium, cement, fertilisers, electricity and hydrogen; importers must hold certificates against verified emissions [2].
• Creates a uniform price signal where multilateral negotiation has delivered slow decarbonisation.

Where it strains CBDR-RC

• Uniform benchmark, unequal capability: a single carbon price applied to all exporters ignores differing development stages — the core of differentiation.
• Cost without finance: compliance burdens fall on developing exporters even as promised developed-country climate finance remains unfulfilled [1]; BRICS has instead pressed the Baku-to-Belem Roadmap to mobilise USD 1.3 trillion for NDCs [3].
• Extraterritoriality: a domestic standard is substituted for negotiated outcomes, raising questions of consistency with WTO non-discrimination norms (MFN and national treatment).
• Trade exposure: India's steel exports are particularly vulnerable, adding a competitiveness dimension to an environmental measure [1].

The developing-country pushback

• At the 12th BRICS Environment Ministers' Meeting (New Delhi, August 2026), such measures were termed "unilateral, punitive, discriminatory and protectionist" [1], marking BRICS as a coordinated southern voice on trade-climate equity.

Scope for reconciliation

• CBDR-RC does not forbid carbon pricing; it conditions its terms. Recognition of carbon prices already paid in the exporting country, de-minimis thresholds and SME facilitation [2] show that design can absorb differentiation.

The tension is therefore not between climate ambition and equity, but between how ambition is financed and shared. A negotiated route — mutual recognition of domestic carbon markets, technology transfer and honouring finance pledges under the Paris framework — can convert a contested border levy into cooperative decarbonisation, keeping CBDR-RC the anchor rather than the casualty of global climate action.