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This T20 Policy Brief sends a loud exhortation to the leaders meeting in the G20 Summit in Hamburg in July 2017. T20 or "Think 20" is a network of think tanks in the G20 countries, and 23 experts in 13 think tanks in 8 countries contributed to this policy brief. Ecologic Institute founder R. Andreas Kraemer, Senior Fellow at the Centre for International Governance Innovation (CIGI), led the drafting, and Benjamin Boteler, Ina Krüger, and Grit Martinez of Ecologic Institute contributed. The policy brief is available for download.

The ocean is a potential driver of growth, jobs, and innovation, with assets of US$24 trillion and annual benefits of US$1.5–2.5 trillion. The ocean economy can be about 3-5% of global GDP or possibly the size of France or California.

Gaps and weaknesses in policy and law, implementation and enforcement result in unregulated or illegal activities, and inadequate stewardship. This bad governance increases investment risks and holds back growth of a sustainable ocean economy. The G20 should initiate blue economy strategies and review them at each summit to ensure that the 'Blue Economy is Green'. In particular:

• A global Ocean governance process initiated by G20 and a call for Ocean Economy dialogues and strategies in regional cooperation could potentially ensure that investment and growth in ocean use become sustainable and reach their full potential.
• The ocean is the largest and a most critical ecological system with many interactions among the Sustainable Development Goal for the Ocean (SDG14), and other SDGs. It is the most biologically diverse and productive system on the planet, and potentially the largest provider of food, materials, energy, and other ecosystem services.
• Past and current uses are unsustainable. Rising demand for resources, technological advances, overfishing, climate change, pollution, biodiversity and habitat loss, inadequate stewardship and enforcement are causing the ocean's decline.
• The Ocean as a regular G20 agenda item could potentially improve governance. A "green" Ocean Economy can enhance its health and productivity, and reverse the ocean's decline. True  valuation and Blue Economy strategies can reduce conflicts among uses, ensure financial sustainability, ecosystem integrity and prosperity, and promote long-term national growth and employment in maritime industries.

This T20 Policy Brief provides detailed information and links to another ocean-related T20 Policy Brief with a focus on the UN Sustainable Development Goal 14 (SDG14): "The Ocean Dimension of the 2030 Agenda: Conservation and Sustainable Use of the Ocean, Seas, and Marine Resources for Sustainable Development", to which R. Andreas Kraemer also contributed.