The last several centuries have each come to have a defining theme: the Age of Enlightenment, the Age of Imperialism, the American Century. We do not know how the 21st will be remembered, but we can say with conviction what its defining goal should be: to grow the circle of opportunity until it reaches all of us, especially those in what is sometimes called the Global South. This task begins, and will be deeply intertwined with, the fight against climate change.

Working to improve our condition has always been noble work. Human life, after all, has immeasurable inherent worth. What is new is the extent to which this effort is also animated by urgent self-interest. In our interconnected world, inequality anywhere is a threat to prosperity and stability everywhere. Destabilizing forces will only grow stronger as disparities widen due to accelerating climate change. Imagine a world in which the global refugee population grows by additional hundreds of millions. What will it look like on America’s southern border, or on the shores of the Mediterranean?

Climate change is pulling our fortunes apart. It is surprising, therefore, to realize that it also stands to become a powerful force for bringing us together. Because almost all future emissions growth will come from emerging markets, nothing done elsewhere matters if the developing world fails to decarbonize. That, in turn, requires a massive increase in investment. According to the International Energy Agency, annual clean energy investments in emerging and developing economies must grow seven-fold, to $1 trillion by 2030, if we are to achieve the Paris goals.

If we are successful in making these investment flows happen, it will be the ultimate triple bottom line exercise: delivering profits, decarbonization, and development in equal measure. Getting there is not easy, and there are many well understood challenges: the enabling environment in many countries, a dearth of bankable projects, and limited institutional capacity to name a few.

Less well appreciated is that there are also strong reasons for optimism.

These include the fact that a coalition of unprecedented breadth, scale, and institutional capacity is emerging to tackle the problem of decarbonization in developing countries, including the financial sector, governments, philanthropy, civil society, and developing countries themselves. Developing countries have never had resources like this at their disposal.

This new coalition is ambitious and willing to experiment with new approaches. The G7 is committing tens of billions to Just Energy Transition Partnerships with developing countries, while the Global Financial Alliance for Net Zero is self-organizing over $100 trillion of private capital to address these problems. Global philanthropy, meanwhile, is increasingly willing to step in and provide risk capital at a scale that historically was strictly the provenance of government.

Our work at the Asian Development Bank is a microcosm of these efforts. We are substantially raising our ambition—to $100 billion in total climate finance by 2030. We are also launching experimental new partnership platforms, philanthropic vehicles, blended finance tools, and new forms of transition finance, working with a broader range of partners than ever.

The most important and powerful reason for optimism is that massively increasing the flow of investment capital flowing from the developed to developing world just makes basic economic and financial sense. Larry Summers captured this insight when he noted that the single thing about Earth that would most surprise an alien economist studying our planet is the lack of “large continuing flows from the aging, slowly growing global North to the much broader global South.” The best way to use the savings glut of the rich is among the world’s poor.

There is in fact nothing really new in this story. The original firm of JP Morgan was built, father in one country and son in another, on the very same notion: facilitating the flow of excess savings from a slow growing, developed society to a dynamic, unproven emerging market—in that case from the UK and Europe to the United States.

The 18th century saw the forceful articulation of ideas of liberty, equality, and fraternity, concepts so powerful that they toppled the empires that denied them. The next century was dominated by those who benefitted from these ideas but did not extend their reach to others. The 20th by a nation that celebrated, in law and aspiration, the universality of claims to human dignity. If we are to leave our children the world they deserve, there is no higher purpose than to ensure this journey reaches its necessary conclusion, and that in the 21st century the gift of opportunity, and the promise of flourishing, become accessible to all.

This article is also published by The Banker. Illuminem Voices is a democratic space presenting the thoughts and opinions of leading Sustainability & Energy writers, their opinions do not necessarily represent those of illuminem.