🌍 Can satellites help governments identify where climate action is most urgently needed?

Methane (CH₄) is one of the most important short-lived climate pollutants. Although it remains in the atmosphere for a much shorter time than carbon dioxide, its warming effect is far more powerful over the near term. As a result, reducing methane emissions is increasingly recognised as one of the fastest opportunities to slow climate change.

Yet an important challenge remains: where should monitoring and mitigation efforts be prioritised?

Traditional monitoring networks often provide detailed information at specific locations, but continent-scale assessments remain difficult because of Australia's vast geographic extent and diverse landscapes.

🛰️ Looking at methane from space

To address this challenge, our recent study developed a transparent and reproducible framework using Sentinel-5P satellite observations to assess atmospheric methane patterns across all eight Australian states and territories between 2019 and 2024.

Rather than focusing on individual facilities or local emission sources, we aimed to understand broader spatial and temporal methane patterns at the continental scale.

The framework combined satellite observations, spatial statistics, hotspot analysis, and sensitivity testing to identify regions that consistently exhibited elevated atmospheric methane concentrations.

📊 What did we discover?

Several important patterns emerged.

Atmospheric methane concentrations increased by approximately 44 ppb across most Australian jurisdictions during the study period.

A consistent seasonal signal was also observed, with spring emerging as the dominant methane season across much of the continent.

Most importantly, persistent methane-enhancement zones were identified in the Northern Territory, Queensland, and Western Australia. These regions repeatedly appeared as statistically significant high-concentration clusters, suggesting that they may warrant additional monitoring and investigation.

Importantly, the study focuses on atmospheric methane concentrations rather than direct emission measurements. The identified hotspots should therefore be viewed as priority areas for follow-up assessment rather than definitive evidence of specific emission sources.

🌏 Why does continental-scale monitoring matter?

Climate policy often depends on understanding where resources can have the greatest impact.

Large-scale satellite observations provide a consistent and comparable perspective across jurisdictions, helping decision-makers identify broad patterns that may not be visible from local monitoring networks alone.

This type of information can support:

• Regional methane monitoring strategies

• Priority-area screening and resource allocation

• Environmental reporting and inventory evaluation

• Climate adaptation and mitigation planning

• Evidence-based decision-making across multiple jurisdictions

🎯 Beyond Australia

One of the most important aspects of this work is that the framework is transferable.

The same satellite-based approach can be adapted to other countries and regions seeking cost-effective methods for identifying atmospheric methane patterns and prioritising areas for further investigation.

As satellite observations continue to improve, such frameworks can help bridge the gap between environmental monitoring and practical climate policy.

In this sense, the goal is not simply to map methane concentrations, but to support smarter climate decisions.

🌱 Supporting SDG 13

Methane mitigation is increasingly recognised as a critical component of global climate action.

By providing a transparent and scalable approach for atmospheric methane assessment, this work contributes to SDG 13 (Climate Action) and demonstrates how Earth observation technologies can support more informed environmental governance.

💬 Looking ahead

Can satellite observations help governments move from climate monitoring to climate action?

I welcome discussion and collaboration with researchers, policymakers, and practitioners working in remote sensing, environmental monitoring, climate policy, methane mitigation, and sustainable development.