Comprehensive climate change policy requires policy measures across different policy domains, such as energy policy, construction, transport, among others. Interest groups are vital for shaping agendas and providing information on complex policy issues such as Climate Change. In this paper, I analyze lobbying networks within and across policy domains. I focus on climate change policy relevant bills in the United Kingdom from 2010 to 2023, mapping both the development of lobbying coalitions over time and across policy domains. I can show that coalitions are largely stable within domains, but we increasingly see cross-domain interactions of interest groups forming coalitions on both the pro-climate and anti-climate side of policy issues, which reflects the growing importance and contention of Climate Change policy.