Earth Day tends to arrive with a lot of numbers.
Tons of carbon. Degrees of warming. Barrels spilled, acres lost, species counted down.
It rarely arrives with a number for what is still here.
For most of modern economic history, the ocean has been valued by what can be taken from it: fish landed, oil extracted, minerals surveyed. The living systems that produce those things, and the much larger web of processes that sustain the planet, have been treated as background. Free. Assumed.
Silent, when in fact they are anything but.
On Monday, Michael marked the sixteenth anniversary of the Deepwater Horizon blowout with a reflection on what oil costs: in dead zones, in dismantled oversight, in blood.
Today, I want to write about what the ocean is worth.
What the Ledger Leaves Out
In 1997, an ecologist named Robert Costanza did something economists had largely avoided: he tried to put a number on nature.
Not on timber or fish or oceanfront real estate, but on the work ecosystems perform simply by existing. Wetlands absorbing storm surge. Forests filtering drinking water. Reefs sheltering the fisheries that feed a billion people. Oceans cycling carbon, producing oxygen, moderating the climate at a scale no human technology approaches.
Costanza and his colleagues calculated, service by service, what it would cost to replicate these functions artificially, or to live without them. Updated in 2014, the estimate reached $125 trillion per year, more than the entire global economy.
For comparison, the global oil and gas industry generates four to five trillion dollars annually.
A fraction of what ecosystems actually produce, and what our economies have organized themselves around.
The numbers are contested. Some economists argue the figure is far too low. Others, including many conservationists, argue that pricing nature is a category error: that assigning a dollar value concedes the terms of a market that was never built to defend it.
Both critiques hold.
A coral reef is not worth its per-hectare dollar figure the way a warehouse is worth its square footage. The number is a translation, not a truth.
But translation has a way of shaping what is seen, and what we are able to perceive.
What appears on the ledger is accounted for.
What remains outside of it is easier to overlook.
What a Whale Is Worth
The ledger has always had blind spots for species whose influence exceeds what their numbers suggest.
Ecologists call them keystone species, organisms whose influence on an ecosystem is disproportionate to their numbers. Remove them, and the system around them begins to shift. Sometimes slowly. Sometimes all at once.
Sea otters keep kelp forests intact by preying on urchins. Sharks shape where and how their prey move, keeping seagrass meadows and coral reefs from being overgrazed. Whales move nutrients across ocean basins, linking surface and depth in ways we are still beginning to understand.
In the Gulf of Mexico, fewer than sixty Rice’s whales remain.
They are the most endangered baleen whale species on Earth, a species only formally recognized in 2021, already on the edge of disappearing. Their range overlaps almost entirely with active and proposed oil and gas leases.
A Rice’s whale does not appear on a balance sheet.
It produces no extractable product.
Within the system it inhabits, it is something else entirely.
What would be lost with it is not contained to the animal itself, but to the relationships it is part of, many of which are only partially visible to us, and only partially heard.
The full accounting tends to arrive later.