What is a 1.5°C Aligned Target?

Quick Answer: A 1.5°C aligned target is a greenhouse gas emissions reduction commitment set by an organisation that follows a scientifically validated pathway consistent with limiting global warming to 1.5°C above pre-industrial levels. The Science Based Targets initiative (SBTi) typically validates these targets, and they cover both near-term milestones and long-term net-zero commitments. For companies measuring and reducing their carbon footprint, a 1.5°C aligned target provides the scientific foundation that separates credible climate action from unsubstantiated claims.

What Is a 1.5°C Aligned Target?

A 1.5°C aligned target is a corporate emissions reduction commitment calibrated to the level of ambition required to keep global average temperature rise within 1.5°C of pre-industrial levels, as established by the Paris Agreement in 2015.

The 1.5°C threshold matters because the scientific evidence is clear: warming beyond this level significantly increases the risk of irreversible climate impacts, including more frequent extreme weather events, accelerated sea level rise, and widespread disruption to natural systems (IPCC, 2018). Limiting warming to 1.5°C rather than 2°C reduces those risks substantially.

For an organisation, setting a 1.5°C aligned target means committing to reduce emissions at a rate consistent with global emission pathways modelled by climate scientists. It is not a self-declared ambition. To be credible, the target requires validation against a recognised methodology, most commonly through the SBTi.

How Does the SBTi Define 1.5°C Alignment?

The Science Based Targets initiative (SBTi) is the primary body that validates whether a corporate target qualifies as 1.5°C aligned. CDP, the United Nations Global Compact, World Resources Institute, and WWF established it as a collaboration.

Under SBTi criteria, a 1.5°C aligned target must meet two requirements:

• Near-term targets: Emissions reductions to be achieved within 5-10 years of the target submission date, with meaningful Scope 3 coverage where those emissions exceed 40% of total footprint.
• Long-term targets: A commitment to reach net-zero emissions across all scopes no later than 2050, consistent with the SBTi Corporate Net-Zero Standard.

For years, the standard near-term figure under the most common methodology has been a fixed 42% absolute reduction in Scope 1 and 2 emissions by 2030 (roughly 25% for Scope 3), calculated from a 2020 base year at a linear 4.2% annual rate. That changed on 14 April 2026, when SBTi updated its Absolute Contraction Approach to let companies distribute reductions differently across the full pathway to 2050, crediting progress already made since their base year. For a company setting a new near-term target now, this can produce a considerably less steep 2030 requirement than the historic 42% figure, depending on the base year chosen and progress already achieved. Companies that validated targets before 14 April 2026 are not retroactively affected and remain on the original trajectory. The change affects the shape of the near-term curve, not the 2050 net-zero destination, which is unchanged.

The SBTi uses two main methodologies to set 1.5°C aligned targets: the Absolute Contraction Approach, used by the large majority of validated companies, which applies a linear reduction rate to a company's total emissions, and Sectoral Decarbonisation Approaches (SDA), which apply sector-specific pathways restricted to a small number of homogeneous, energy-intensive industries such as steel, cement, and aviation.

Once validated, the SBTi lists a company's targets publicly on its website, providing a verifiable signal to customers, investors, and regulators.

What Does a 1.5°C Aligned Target Cover?

A complete 1.5°C aligned target covers all three scopes of emissions as defined by the GHG Protocol:

• Scope 1: Direct emissions from sources owned or controlled by the organisation (company vehicles, on-site combustion)
• Scope 2: Indirect emissions from purchased electricity, heat, and cooling
• Scope 3: All other indirect emissions across the value chain, including purchased goods and services, business travel, employee commuting, and product use and disposal

Scope 3 is where most organisations carry the majority of their carbon footprint, and it is also where target-setting is most complex. The SBTi requires companies to set Scope 3 targets if those emissions represent 40% or more of total emissions. For many businesses, this means engaging suppliers and customers as part of the reduction strategy, not just optimising internal operations, an approach covered in more depth in Seedling's guide to Scope 3 supplier engagement. Accurate, full-scope carbon accounting is a prerequisite for setting a credible 1.5°C aligned target. Without a reliable baseline across all three scopes, no organisation can model a reduction pathway or demonstrate progress against it.

Why Does a 1.5°C Aligned Target Matter for Your Business?

Setting a 1.5°C aligned target has moved from voluntary best practice to a practical business requirement for many organisations, driven by three converging pressures.

Regulatory and reporting requirements are increasing. Frameworks including SECR, CDP, and the emerging requirements under ISSB's IFRS S2 standard either require or strongly incentivise science-based target disclosure. Procurement frameworks such as PPN 006 in the UK public sector now ask suppliers to demonstrate credible net-zero commitments, and 1.5°C aligned targets are the recognised standard for doing so.

Investor and customer scrutiny has sharpened. 44% of investors believe climate change should be among the top five priorities for a company (PwC, 2022). Procurement teams at larger organisations increasingly require suppliers to hold validated science-based targets as a condition of doing business.

Greenwashing risk is real and growing. A self-declared commitment to "reduce emissions" or "become carbon neutral" carries no scientific weight without a validated methodology behind it, and regulators are paying closer attention. The UK's Competition and Markets Authority and equivalent bodies elsewhere have increasingly scrutinised vague climate claims, and a validated SBTi target is one of the clearest ways to demonstrate that a commitment is backed by evidence rather than aspiration, a distinction Seedling's guide to carbon reduction vs offsetting explores further.

For businesses starting this process, the practical starting point is the same regardless of ambition level: an accurate, full-scope carbon footprint. Seedling's carbon accounting software produces GHG Protocol-aligned footprints across Scopes 1, 2, and 3, with the data quality and documentation needed to support SBTi target-setting, whichever methodology and base year ultimately apply.

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