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A new edition of the leading guidance document for assessing greenhouse gas emissions in Environmental Impact Assessment has been published. The main changes are:
IEMA鈥檚 guidance was first published in 2017 and has been widely followed as good practice for this area of EIA. It firmly established the principle that GHG emissions are cumulatively significant, with assessing and mitigating them being a core part of EIA for development projects.
A challenge has been differentiating the significance of emissions between projects and drawing Environmental Statement conclusions that decision-makers can apply consistently. This guidance update is timely, tackling the challenge with a net zero aligned methodology.
听
A lot has changed since 2017. The UK has adopted a net zero target, COP26 in Glasgow brought renewed public attention to leadership in this area and the IPCC鈥檚 emerging Sixth Assessment Report underscores again the severe consequences of not staying within a rapidly diminishing global carbon budget.
In this context, the sustainability of development projects comes under close planning, legal and public scrutiny. GHG mitigation and the EIA process must be robust and draw clear, evidence-based conclusions.
It can be hard to distinguish the significance of emissions between developments of different types and scales. A projects impact might be small on a national scale but cumulatively could undermine the UK鈥檚 net zero goal. Methodological clarity on how to assess and communicate this, in a way that embeds a proportionate level of mitigation, is needed now more than ever.
Methods for calculating GHG emissions are well established. But one of the biggest current challenges has been finding the best way to create a clear methodology that acknowledges the importance of every tonne of CO2听emitted while usefully communicating to developers and decision-makers the impact of different developments with different levels of performance.
The new guidance offers a more detailed, descriptive scale that aligns more closely with EIA practice. The significance of different levels of CO2听emissions will be described from: beneficial, to negligible, minor, moderate, and major adverse effects.
Each description relates to the rate of emission reduction needed to achieve an applicable trajectory towards net-zero, whether at a sectoral or economy-wide level. And in turn, this helps support our contribution to stay within a 1.5-degree compatible global carbon budget.
To encourage good design and support emissions mitigation. And by doing this, having an assessment practice in place that can reward good development performance by bringing that clearly to a decision-maker鈥檚 attention.
It鈥檚 aimed at the needs of decision-makers and developers, those who will apply this guidance on a project. It鈥檚 also hugely beneficial to our own needs, as the people writing environmental service chapters, for methodological clarity.
Whole Life-Cycle Carbon (WLC) emissions are the carbon emissions resulting from the materials, construction and the use of a building over its entire life, including its demolition and disposal.
A WLC assessment provides a true picture of a building鈥檚 carbon impact on the environment, and the new guidance covers this. It calculates whether it can reach a conclusion about the net lifetime effects of developments and where operational benefits may compensate for some of the construction stage impacts.
Why this is so vital for the future?
鈥淚t鈥檚 a simple breakdown: to be able to shape developments in a way that reduces or avoids GHG emissions is absolutely paramount. 听And to communicate the outcomes of this through EIA in a clear, concise way that high-quality development can be differentiated and supported through is crucial鈥.