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The proverbial administrative complexity of Paris and its region, which also includes a metropolitan authority since 2016, has not prevented multiple and rapid changes to take place in the last decade. A national government decision has initiated the construction of a new regional metropolitan public transportation infrastructure that has leveraged more than €15 billions of green bonds. Mounting environmental challenges are triggering new societal priorities and legal changes, heightened by the COVID-19 crisis context. Since 2014, projects and plans led by local governments to value nature-based solutions (NBS) have met a rising interest from national and international investors and developers, in a context of multiple climate and biodiversity initiatives from the private sector and the civil society. However, assessing their long-term value remains a challenge for both governments and researchers while the calls for nature to remain a common good stir new forms of vigorous social engagement. The Paris case shows that the art of creating NBS that maximize biodiversity and support CO₂ reduction at large metropolitan scale depends on two priorities. The first is strengthening global commitments. The second is refocusing existing massive investments in grey infrastructure systems, so far major drivers of public investments, as infrastructure for distribution, unlocking local biodiversity valuation potential, and supporting social innovation.