 
	How much would it cost to buy the ocean? - Astrid J. Hsu
 Surveying his vast domain, 
 trident heavy in hand,
  Poseidon considers 
 the prospect of retirement.
  What if someone else donned
 the coral crown
  so he could spend his immortality
 harmonizing with blue whales
  and cozying up to hydrothermal vents?
  Poseidon decides he needs to actually
 prioritize himself for once.
  So he summons his accountant and asks:
  how much could he sell
 the ocean for today?
  Poseidon’s accountant is the
 top-ranked financial analyst
  to the world’s movers and shakers,
  its literal titans of industry.
  He handles all divine assets.
  When it comes to boiling complex systems
 of intrinsic value down to monetary sums,
  he’s the guy.
  And he’s actually got a potential buyer:
  Hades is interested in building
 his real estate portfolio
  and expanding his domain
 into the marine realm.
  So, the accountant already appraised
 the ocean’s market value
  and prepared a quick presentation.
  "The property covers
 over 70% of Earth’s surface.
  But it’s also quite voluminous!"
  Poseidon knows this.
  He does annual Mariana Trench
 swims with sea cucumbers.
  But before he even gets
 to his best giant squid story,
  the accountant is back at analysis.
  "Marine shipping alone accounts
 for 80% of global trade,
  generating over $14 trillion annually.
  The global fishing industry 
 provides over 3 billion people
  with a significant amount 
 of their dietary protein,
  employs an estimated 260 million,
  and generates about $163 billion
 every year.
  And oil and budding
 seabed mining industries
  generate around $245 billion per year."
  "Some of the ocean’s assets
 are harder to quantify monetarily.
  The ocean absorbs around 30%
 of human generated carbon dioxide,
  and, since 1955, has taken
 in more than 90% of excess heat.
  About 40% of humanity lives
 within 100 kilometers of the ocean.
  Coastal ecosystems buffer waves,
 reduce erosion, and ease flooding,
  preventing over $716 billion
 in damages annually.
  Many cultures have deep ties to the ocean.
  And coastal views and recreation
 improve mental health.
  Meanwhile, it's estimated
 that as-yet undiscovered
  marine-derived cancer treatments
 could save countless lives
  and be worth up to $5.7 trillion.
  The ocean generates half
 the planet’s oxygen
  and, directly or indirectly,
  provides food, energy, and minerals
 to all life on Earth."
  A salty tear cascades down Poseidon’s face
 that the accountant ignores.
  He can’t give the total cost yet
 because, of course,
  recent developments must be factored in.
  "Climate change is heating, acidifying,
 and deoxygenating the ocean
  and trash is polluting it.
  Overfishing and aggressive 
 seabed resource extraction
  are disrupting fragile ecosystems
 and impacting the ocean’s productivity."
  The accountant says, "Sigh, buddy,
 you shouldn’t worry, though,
  because we can grow
 the ocean’s investment value.
  Coral reef tourism already yields
 approximately $36 billion annually.
  Considering the revenue
 of popular dive sites
  and their regional shark
 populations and lifespans,
  researchers estimate that one shark can
 generate almost $2 million
  in its lifetime—
  making them much more valuable
 alive than dead.
  Sustainable management of fisheries
 could allow species to rebound
  and bring in an additional
 $83 billion annually.
  And with growth in offshore wind, 
 tidal, and wave energy harvesting,
  the ocean is poised to help
 humanity quit fossil fuels."
  Now the grand reveal.
  The accountant's conclusions are similar
 to those of mortal experts:
  the ocean alone is worth
 roughly $24 trillion—
  at least— about a quarter
 of the World Bank’s valuation
  of the global economy in 2021.
  But if humanity reinvests
 in the ocean's health—
  fishing sustainably,
 decarbonizing shipping,
  scaling offshore wind farms,
 and conserving and restoring mangroves—
  investments could return
 up to 600% in profits.
  Poseidon feels the weight of his folly
 crushing him
  like a Styrofoam cup 2,000 meters deep.
  Reducing such a priceless, generously
 life-giving natural system to a number
  is just another symptom of the greatest
 problems he’s facing nowadays.
  And though he respects the work
 his brother, Hades, does,
  he doesn't want the ocean to become
 an extension of the Underworld.
  He can’t give it up.
  Poseidon asks forgiveness
  and reaffirms his eternal vow
 to protect the ocean.
  It’ll take him a few tidal cycles
 to realize Hades and the accountant
  were bluffing 
 and see what this really was:
  a much-needed intervention by a duo
 of deities who cared deeply about him—
  and the world.