The secondary research process involved comprehensive analysis of environmental regulatory databases, peer-reviewed energy journals, technical engineering publications, and authoritative climate organizations. Key sources included the US Environmental Protection Agency (EPA), US Department of Energy (DOE), International Energy Agency (IEA), Global CCS Institute (GCCSI), Intergovernmental Panel on Climate Change (IPCC), European Commission Directorate-General for Climate Action, European Environment Agency (EEA), International Association of Oil & Gas Producers (IOGP), Carbon Capture Coalition, World Business Council for Sustainable Development (WBCSD), International Journal of Greenhouse Gas Control, Energy & Environmental Science Journal, National Center for Biotechnology Information (NCBI/PubMed) for environmental health studies, World Bank Carbon Pricing Dashboard, OECD Environment Statistics, and national energy ministry reports from key markets including Norway, UK, Canada, Australia, China, and Japan. These sources were used to collect carbon pricing data, CCS project pipeline statistics, storage capacity assessments, regulatory policy frameworks, emission reduction targets, and technology cost curves for post-combustion capture, pre-combustion systems, direct air capture, bioenergy with carbon capture and storage (BECCS), and enhanced oil recovery (EOR) applications.