Net zero
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Understanding Net Zero: Definitions, Challenges, and Pathways
Introduction to Net Zero Emissions
Net zero emissions have become a central goal in global climate politics, particularly since the adoption of the Paris Agreement in 2015. The concept of net zero involves balancing the amount of emitted greenhouse gases with an equivalent amount of carbon removal, aiming to stabilize global temperatures and mitigate climate change impacts Green2023Rogelj2023. However, the term "net zero" is often ambiguously defined and varies across different contexts and scales, leading to significant knowledge and process gaps .
Defining Net Zero: Variations and Gaps
Diverse Definitions and Scales
The term "net zero" is used across various scales, from single buildings to entire countries. However, there is a notable absence of definitions concerning country-wide emissions, particularly from sectors like agriculture, forestry, and large-scale transportation . This lack of clarity can hinder the development of effective policies and strategies for achieving net zero emissions.
Knowledge and Process Gaps
Research has identified four main areas where knowledge and process gaps exist: governance, design, measurement and verification, and circular frameworks . These gaps highlight the need for clear definitions that include explicit system boundaries, emission scopes, and life-cycle energy and greenhouse gas (GHG) emissions.
Challenges in Achieving Net Zero
Hard-to-Decarbonize Sectors
Certain sectors, such as aviation, long-distance transport, steel and cement production, and reliable electricity supply, are particularly challenging to decarbonize. These sectors require substantial technological advancements and coordinated efforts across energy and industry sectors to achieve minimal emissions . The integration of discrete energy sectors and industrial processes is vital for a successful transition to a net-zero emissions energy system .
Robustness of Net Zero Targets
Despite the widespread adoption of net zero targets, only a small fraction of these targets meet the minimum criteria for robustness, including timing, status, coverage, use of offsets, and governance . Strengthening these targets and their implementation is crucial for delivering Paris-consistent action and securing more ambitious climate goals .
Pathways to Net Zero
Energy Systems and Technological Solutions
Achieving net zero emissions will likely depend on vast amounts of inexpensive, emissions-free electricity, mechanisms to balance electricity demand and generation, and alternative materials and manufacturing processes for structural materials . Recycling and carbon management will also play a significant role in any net-zero emissions energy system .
Policy and Governance
Policymakers need to focus on setting standards for robust net zero targets and building the capacity of entities, particularly in the global South, to meet the technical and resource challenges required for effective implementation . Additionally, there is an urgent need for more research on the political conditions that promote or constrain the creation and implementation of net zero policies across sectors .
Conclusion
The journey to net zero emissions is complex and multifaceted, involving diverse definitions, significant challenges, and various pathways. Addressing the knowledge and process gaps, particularly in hard-to-decarbonize sectors, and strengthening the robustness of net zero targets are essential steps toward achieving global climate goals. Coordinated efforts in policy, governance, and technological innovation will be crucial in navigating the path to a sustainable, net-zero future.
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