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IEA (2020), Average annual investment in technologies in heavy-industry that are today at pre-commercial or early adoption stages by maturity level, IEA, Paris https://www.iea.org/data-and-statistics/charts/average-annual-investment-in-technologies-in-heavy-industry-that-are-today-at-pre-commercial-or-early-adoption-stages-by-maturity-level, Licence: CC BY 4.0
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