We often talk about climate change in the future tense, but the physical reorganization of our world is already happening in real-time. It is a story of where we can stay, where we must leave, and how we might restore the land and waterways that connect all species that share this planet. For more than a century, people have built rigid concrete defenses against rising sea levels and in an attempt to dam and direct rivers to suit our immediate needs. But the physical reality of our planet is now demanding a total reorganization of where—and how—we live together as part of an ecosystem that is far bigger and more powerful than us rather basing our construction on the belief that people can dominate nature.
As we face this transition in mindset and practical living, we are guided by a fundamental climate choice first formulated by physicist and former presidential science advisor Dr. John Holdren:
We basically have three choices when it comes to our changing climate: mitigation, adaptation and suffering. Holdren acknowledges that we’re going to do some of each. The question he asks us is what the mix is going to be. Increase one of the three, and we will do less of the second and third. To many minds, this is the goal: the more mitigation we do, the less adaptation will be required and the less suffering there will be.
Following on from his framework of these three pie pieces, I’ve been thinking about three distinct pieces of research that point us toward where the climate transition is leading us.
1. The Physics of Departure: The Sinking Gulf
A new study recently published in Nature Sustainability brings the urgency of Dr. John Holdren’s triad into sharp focus for the American South. In the Gulf Coast, specifically around New Orleans and the surrounding delta, researchers have identified a compounding crisis: the land is physically sinking (subsidence) at the same time the ocean is rising. This is a perfect storm that threatens one of the most culturally rich cities in the U.S.
The Acceleration of Relative Sea-Level Rise
Using high-resolution satellite data and GPS monitoring, the study reveals that the land in this region is moving downward at a rate significantly higher than previously estimated. This creates a Relative Sea-Level Rise that is often double or triple the global average. While the world discusses centimeters of rise over decades, communities in the Gulf are dealing with inches of lost elevation in just a few years.
This subsidence is driven by a combination of natural sediment compaction and human activity, including the extraction of groundwater and fossil fuel. Because we have dammed the Mississippi River (as discussed in our next section), the natural delivery of new sediment that used to replenish the delta has been cut off. The land is starving for the very silt that used to keep it above water.
The Limits of Adaptation
When the land physically disappears, the limits of adaptation are breached. We reach a point where holding the line with higher levees and stronger pumps becomes a mechanical impossibility. We cannot prevent a flood with a tablespoon while the tap is turned up to full blast. This is rapidly shutting down the option mitigation. Therefore, it forces the zero-sum choice Holdren warned us about: New Orleans must choose between managed retreat—a proactive, planned relocation—or unavoidable suffering for those left behind.
Relocation in this context is not just a logistical move; it is a cultural crisis. To avoid mass suffering, we need a framework for place-making that moves entire community networks together. If we don’t plan for the transfer of the community—the music, food, heritage, and social bonds—we risk losing the soul of the Gulf to the rising water.
2. Working With the Water: America Undammed
While the coast sinks, our inland arteries are being liberated through a radical shift in infrastructure policy. As reported by the New York Times, the United States is currently undergoing a massive effort to dismantle thousands of obsolete dams—many of which have outlived their 50-year lifespans and now pose significant safety risks to downstream communities.
This is proactive adaptation in its purest form. For over a century, we treated rivers as plumbing—static pipes to be redirected, blocked, and controlled. Now, we are learning that a free-flowing river is a far superior neighbor than one trapped behind aging concrete.
The Multi-Species Dividend of Restoration
When a dam is removed, the results are often instantaneous and transformative. By restoring the natural flow, we allow for the return of sediment—the literal building blocks of the land—which has been trapped in reservoirs for decades. This sediment is what naturally replenishes deltas and keeps coastal lands from sinking, directly impacting the crisis seen in and around New Orleans.
Furthermore, removing these barriers restores migratory paths for fish and wildlife that have been blocked for generations. It is an act of biological reconciliation that allows species to move toward cooler waters as temperatures rise, a key component of the Deep Adaptation required in a changing climate.
The Safety and Financial Calculus
Beyond ecology, the Undammed movement is a response to the mechanical failure of the 20th-century model. Aging dams are increasingly unable to handle the 1,000-year flood events that are becoming more frequent. Removing them is a strategic choice to avoid the catastrophic suffering of a dam failure. By restoring natural floodplains, we create massive, landscape-scale sponges that can absorb and slow down water surges, protecting human infrastructure by working with the water’s energy rather than trying to stifle it. We’ve made water a foe when we’re much better off giving it the room it needs to be our friend.
3. The Nomad Century: The Infrastructure of Global Movement
If the sinking Gulf represents the limits of adaptation and the undammed rivers represent the liberation of nature, then Gaia Vince’s book Nomad Century: How Climate Migration Will Reshape Our World represents the inevitable human response: The Great (Human) Migration. We are moving toward a reality where the map of human habitation must become as fluid as the climate itself.
To manage this transition without catastrophic suffering, we must move away from the 20th-century model of fixed borders and toward a 21st-century model of managed movement. Given our current geopolitics, this is getting more complicated (and contentious) by the day. There’s no doubt that this requires a radical rethink of our global systems across three specific pillars:
The Digital State and Portable Identity
In a world of mass movement, your identity cannot be tied to a physical piece of paper in a desk drawer that might be lost to a flood or a fire. We need a global framework for Digital Identity—portable, secure, and internationally recognized credentials that allow migrants to carry their medical records, professional certifications, and legal standing with them. This ensures that a doctor from a submerged coast can become a doctor in a receiver city on day one, rather than being trapped in a cycle of structural suffering and economic, intellectual, and talent waste.
The Rise of Receiver Cities
The green zones—latitudes in the north that will remain temperate—must proactively prepare to become Receiver Cities. This is the ultimate test of Holdren’s triad: by investing in massive adaptation now (housing, high-speed transit, and sustainable food systems), these regions can prevent the mass suffering of unplanned, chaotic arrivals. These cities must be designed as expandable machines, utilizing modular architecture and circular resource loops to integrate millions of new residents while maintaining ecological balance and social structures.
Deep Adaptation and the Preservation of Culture
Scholars like Jem Bendell have expanded on this reality through the framework of Deep Adaptation. It acknowledges that because global mitigation failed to prevent significant warming, we must now pivot toward valuing what we want to keep. As communities move, we must build systems to archive and carry forward the culture of humanity—languages, traditions, and social structures—so that when we relinquish the land, we do not lose the soul and the history of the people who lived there.
The Togetherhood Takeaway
We cannot command the planet to stay still. Our survival depends on our ability to move with the land and the water, rather than against them.
- Audit the Mix: Look at your local climate initiatives. Are they focused on mitigation (reducing the cause), adaptation (living with the effect), or is your community opting for future suffering by ignoring the problem?
- Audit the Choice: Demand that your leaders explain their Holdren Mix. Are they spending on adaptation now, or are they effectively budgeting for future suffering?
- Map Your Resilience: Research the topography of your own region. Understanding whether your land is rising or sinking changes every conversation about long-term infrastructure and property.
- Map Your Role: Research your own local geography. Is your community positioned to be a receiver of migration or a sender? This changes every conversation you have about local infrastructure and zoning.
- Advocate for the Flow: Support local river restoration projects. Undamming a waterway is an act of long-term climate insurance for your entire watershed.
- Practice Fluidity: In a Nomad Century, the most valuable skill is the ability to form deep community connections quickly.
- Redefine Home: In a Nomad Century, home must shift from a static point on a map to a commitment to community resilience, wherever that community ends up.
The map is changing. To honor the planet and each other, we must have the courage to move with it. Will we each find it within ourselves to do the mitigation and adaptation needed to limit suffering? That remains the most potent question on the table today for every country, policy maker, and person. Eventually, nature will demand an answer.
Christa Avampato 