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Corals: can they be saved from climate change?

The EconomistDarwin, Dr. Ruth Gates, Ginny, Yimnang Golbu, Craig
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  • Over 70% of the Earth's surface is covered by oceans, which are currently undergoing rapid transformation due to climate change.
  • Coral reefs support one in four marine species and provide food resources, storm protection, and up to 50% of planetary oxygen.
  • More than half of global coral reefs have already died, with the remaining populations facing extinction on a scale that threatens global ecosystems and human survival.
  • Fishing communities in Palau, such as those led by Darwin, are forced to migrate to deeper "blue water" zones as shallow reef fish populations collapse due to coral death.
  • In Hawaii, the Hawaii Institute of Marine Biology is operating as a front line for coral preservation, led by pioneers like Dr. Ruth Gates and Dr. Mary Hagedorn.
  • Scientists are utilizing cryopreservation technology adapted from human fertility clinics to freeze coral sperm at minus 80 degrees Celsius and store it in liquid nitrogen for hundreds or thousands of years.
  • The goal is to create the world's largest coral repository, functioning as a "Noah's Ark" to bank the basic building blocks of life before current species die out.
  • Cryopreservation efforts face significant logistical hurdles, as coral reproduction occurs only once a year for a window of just a few hours, limiting global collection to fewer than 20 coral species out of an estimated 800 worldwide.
  • In Palau, marine biologist Yimnang Golbu identified a "Nicobay" area where corals have naturally evolved resilience to warmer and more acidic waters over millennia.
  • Research indicates that rapid temperature changes, rather than heat itself, are the primary trauma killing corals, prompting scientists to seek specific survival genes in heat-resistant populations.
  • Dr. Ruth Gates is leading a controversial program of "assisted evolution" that involves stress-testing corals in a land-based "gym" to simulate future warming conditions.
  • Following the stress tests, scientists perform selective breeding (in vitro fertilization) to create "super corals" with enhanced biological capacity to survive climate stress.
  • These engineered super corals are currently being deployed back onto the reef to test their ability to restore damaged ecosystems.
  • While 90% of global warming over the past 50 years has occurred in the ocean, the speed of environmental change is outpacing natural evolutionary adaptation.
  • Scientists warn that technology alone is insufficient; protecting "hope spots" and making difficult decisions regarding which species or locations to prioritize will be necessary.
  • The current conservation timeline is described as a race to harvest genetic material before the loss of these ecosystems becomes irreversible, with implications for the survival of 500 million people.