The purpose of this study is to establish consumption-based GHG inventories to enable C40 to better understand the ability of cities to contribute to GHG emissions reduction activities beyond their city boundaries.

According to the C40 Cities Climate Leadership Group, there is tremendous opportunity for collaboration between cities and the private sector to invest in sustainable projects, and also the need to accelerate investment and development in sustainable infrastructure in order to deliver a climate safe future.

This briefing paper examines how cities can contribute to bridging the global emissions gap. It finds significant emission reduction potential – up to two-thirds the impact of recent national policies and actions.

The C40 Cities Climate Leadership Group (C40) has released landmark research demonstrating a clear trend of expanding and accelerating climate action in the world’s megacities.Climate actions, such as implementing rigorous energy efficiency regulations for buildings, instituting bus rapid transit lines or flood mapping efforts, aim to reduce global greenhouse gas emissions and improve urban resilience to climate change.

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The Global Protocol for Community-Scale Greenhouse Gas Emissions (GPC) is a multi-stakeholder, consensus-based protocol for developing internationally recognized and accepted community-scale greenhouse gas accounting and reporting standards.

This is a comprehensive analysis of actions underway in the world’s megacities to address climate change. It not only underscores what cities have done to date, but also what they can do now and in the future as local leaders, and as a collective, to have a significant global impact.