title: Climate Change Act 2008 source: https://www.legislation.gov.uk/ukpga/2008/27 classified: primary ingested: 2026-04-09 tags: [climate, net-zero, carbon-budgets, CCC, adaptation, trading-schemes, legislation] full_text: ~/knowledge/sources/legislation/uk/2008-climate-change-act.md

Climate Change Act 2008

The foundational statute for UK climate policy. It creates legally binding carbon targets, a five-year carbon budgeting system, an independent advisory body (the Committee on Climate Change, now the Climate Change Committee), powers to create emissions trading schemes, and a national adaptation programme.

Royal Assent: 26 November 2008. Principal amendment: net-zero target substituted for 80% target by S.I. 2019/1056, with effect from 27 June 2019.

What it does

The Act does five distinct things:

1. Sets the 2050 target. Section 1 places a duty on the Secretary of State to ensure the net UK carbon account for 2050 is at least 100% lower than the 1990 baseline (net zero). This is legally binding and can only be amended by affirmative order following CCC advice (section 2). The 2050 target is the anchor for all other provisions; every carbon budget must be set on a path consistent with it.

2. Creates the carbon budgeting system. Sections 4–20 require the Secretary of State to set five-year carbon budgets (the maximum permitted net UK carbon account for each period), produce proposals and policies to meet them, report annually on emissions, and lay final statements after each period ends. The budget for the period covering 2020 must represent at least a 34% annual-equivalent reduction from the 1990 baseline. Budgets are set by affirmative order after CCC advice.

3. Establishes the Committee on Climate Change. Part 2 (sections 32–43) creates the CCC as an independent statutory body corporate. It advises on whether to amend the 2050 target, advises on each carbon budget, lays annual progress reports before Parliament, and advises on adaptation. National authorities can give guidance and directions to the CCC but cannot direct the content of its advice or reports. The CCC must establish an Adaptation Sub-Committee (minimum 6 members including chair).

4. Enables emissions trading. Part 3 (sections 44–55) confers power on national authorities to make regulations creating trading schemes: either cap-and-trade limitation schemes or certificate-based encouragement schemes. The principal scheme made under this power is the UK Emissions Trading Scheme (SI 2020/1265), established after the UK left the EU ETS.

5. Requires adaptation planning. Part 4 (sections 56–70) requires the Secretary of State to lay climate risk reports every five years, followed by adaptation programmes. Reporting authorities (public bodies other than Ministers, Parliament and devolved authorities) can be directed to prepare their own adaptation reports.

The 1990 baseline

The reference point for all percentage calculations. It is the aggregate of: - net UK emissions of CO2 for 1990, plus - net UK emissions of each other targeted greenhouse gas for that gas's base year (1990 for methane and N2O; 1995 for HFCs, PFCs, SF6 and NF3).

The baseline cannot be changed except by order under section 2 if there have been significant developments in scientific knowledge or international law.

The net UK carbon account

Not the same as UK emissions. The net UK carbon account for any period equals:

Net UK emissions of targeted greenhouse gases minus carbon units credited to the account (up to the s.11 limit) plus carbon units debited from the account

Carbon units are a defined instrument: they represent a reduction in emissions, a removal of greenhouse gas, or an entitlement to emit under a limiting scheme (section 26). The carbon unit limit per budgetary period is set by the Secretary of State by affirmative order under section 11.

This accounting mechanism is what allows the UK to use international carbon markets. The extent to which that is permitted is constrained by the carbon unit limit the Secretary of State sets for each budget period.

Carbon budget mechanics

Six carbon budgets have been set to date (CB1–CB6), covering through 2037.

Committee on Climate Change (CCC)

Independent statutory body, not Crown-appointed. Members appointed jointly by national authorities (Secretary of State, Scottish Ministers, Welsh Ministers, relevant NI department). Chair plus 5–8 members; must reflect expertise in business competitiveness, climate science, economics and finance, energy, environmental policy, land use, social policy, and technology assessment.

The CCC (now formally called the Climate Change Committee) has become the central institutional mechanism through which UK climate policy is assessed and scrutinised. Its advice on whether the 2050 target needed strengthening to 100% was given in 2019, leading to S.I. 2019/1056.

The CCC's annual progress reports have regularly flagged that the UK is not on track to meet its carbon budgets. Those reports trigger a mandatory response from the Secretary of State.

Trading schemes (Part 3)

Part 3 is a broad enabling power. It allows national authorities to create: - Limitation schemes: participants hold allowances and must cover their activities; they trade allowances. - Encouragement schemes: participants hold obligations to deliver specified amounts of an activity; they earn and trade certificates.

The principal scheme made under these powers is the UK ETS (SI 2020/1265, replacing EU ETS participation post-Brexit). Part 3 is also the legal basis for any future bespoke trading scheme in Scotland, Wales or Northern Ireland.

Adaptation framework

The adaptation provisions in Part 4 operate in a cycle: 1. The Secretary of State lays a climate risk report (UK Climate Risk Assessment, every 5 years). 2. The CCC advises on risks at least 6 months before the report. 3. Within 12 months of the risk report, the Secretary of State lays a National Adaptation Programme and the relevant NI department lays an equivalent for Northern Ireland. 4. Reporting authorities (public bodies) can be directed to prepare their own adaptation reports and must have regard to government guidance.

The CCC's Adaptation Sub-Committee monitors progress. The Committee's annual progress reports must include an assessment of adaptation policy implementation.

Key amendments since 2008

Policy significance

The Act is the primary legal anchor for UK net zero policy. Every major downstream instrument (the UK ETS, Contracts for Difference, capacity market, renewable obligation, network planning, hydrogen strategy) derives much of its justification from the obligation in section 1(1). The carbon budgets set a declining constraint on total UK emissions that is meant to be translated into sectoral pathways via the proposals and policies required under sections 13–14.

The gap between what the carbon budgets require and what current policies deliver is the central tension in GB energy policy. The CCC's progress reports consistently identify this gap; the Secretary of State's responses and explanations for divergence from CCC advice are the primary accountability mechanism.

The Act does not itself mandate any particular technology, fuel, or sector pathway. It creates the envelope within which policy must sit and the process by which that envelope is monitored. The substantive choices (how much nuclear, how much offshore wind, what to do with gas boilers) are made elsewhere.

Connections to other instruments

• UK ETS (SI 2020/1265): Principal trading scheme made under Part 3. The UK ETS replaced UK participation in the EU ETS after Brexit.
• Energy Act 2013: Extended the budgetary period amendment power (s.23(4), via s.1(8)(a) EA 2013). Note: the CfD and capacity market provisions in the Energy Act 2013 draw their statutory authority from the Electricity Act 1989, not from Part 3 of the CCA.
• Energy Act 2023: Amended s.29 on international aviation emissions.
• Gas Act 1986 / Electricity Act 1989: Carbon emissions reduction target provisions amended by Schedule 8.
• Carbon Budget Orders 1–6: The instruments that actually set each budget under section 8.
• Carbon Accounting Regulations (SI 2009/1257): Made under ss.26–27; define how carbon units are registered and credited.
• National Adaptation Programme (third edition, 2023): Most recent programme laid under section 58.

See also: bsc.md, cfd-auctions.md, capacity-market-rules.md