New study finds whales might be our best defense against climate change

Jean-Christophe André

Save the whales, because the whales can save us.

A team of economists at the International Monetary Fund (IMF) waned to drive home how important whales are, so they put it in terms we could understand: money. A new analysis detailed in Finance & Development puts a price tag on exactly how much whales are worth to us, and why we should care about the world's whale population.

Whales absorb large amounts of carbon in their bodies. During the lifetime of the average whale, which is 60 years, it will sequester 33 tons of CO2. In comparison, a tree absorbs up to 48 pounds of CO2 each year. Whales also promote the growth of phytoplankton. Phytoplankton captures 40% of the world's CO2 and contributes at least 50% of oxygen to the atmosphere. "At a minimum, even a one percent increase in phytoplankton productivity thanks to whale activity would capture hundreds of millions of tons of additional CO2 a year, equivalent to the sudden appearance of two billion mature trees," the study says.

Whales promote the growth of phytoplankton in two ways. The movement of whales pushes nutrients from the bottom of the ocean to the surface, which feeds phytoplankton and other marine life. The second way they help with carbon absorption is through their poop. "It turns out that whales' waste products contain exactly the substances — notably iron and nitrogen — phytoplankton need to grow," per the study. Yes, you read that right. Whale poop might be the solution to climate change we've been waiting for.

RELATED: Whales' migration patterns can be tracked by their songs, researchers claim

The IMF says that each whale is worth more than $2 million. All of the world's whales have a value of over $1 trillion. According the IMF, "if whales were allowed to return to their pre-whaling numbers — capturing 1.7 billion tons of CO2 annually — it would be worth about $13 per person a year to subsidize these whales' CO2 sequestration efforts."

The whale population is one-fourth of what it was pre-commercial whaling. There used to be four to five million whales swimming the world's oceans. Now, there's just over 1.3 million. Certain species of whales have dwindled more than others, such as the blue whale, whose population is 3% of what it once was.

The whale population is recovering, however, since commercial whaling ended in 1986, but they still face many other problems, such as overfishing. There is a catch-22 as well. Dwindling whale populations can lead to an increase in greenhouse gases, and an increase in greenhouse gases can decrease the whale population. "Whales are highly mobile creatures, so if climate change causes the prey to move, they will probably follow them. Then there's the increased competition that comes about as surface temperatures change and species move to different habitats — all of a sudden, you have different species using the same area, so there's more competition," Natalie Barefoot, executive director of Cet Law and co-author of a report looking at how whales absorb carbon, told Scientific American.

RELATED: A massive 'stampede' of dolphins spotted off California coast

Increasing the whale population is a "no-tech" solution, and IS easier to execute than some of the other ways suggested to combat climate change. "Since the role of whales is irreplaceable in mitigating and building resilience to climate change, their survival should be integrated into the objectives of the 190 countries that in 2015 signed the Paris Agreement for combating climate risk," the report says.

And now we know exactly what it'll cost. But more importantly, we know exactly what it'll cost if we don't invest in whales.

The Planet

Seventy-five years ago, on January 27, 1945, the Soviet Army liberated the Auschwitz concentration camp operated by Nazi Germany in occupied Poland.

Auschwitz was the deadliest of Nazi Germany's 20 concentration camps. From 1940 to 1945 of the 1.3 million prisoners sent to Auschwitz, 1.1 million died. That figure includes 960,000 Jews, 74,000 non-Jewish Poles, 21,000 Roma, 15,000 Soviet prisoners of war, and up to 15,000 other Europeans.

The vast majority of the inmates were murdered in the gas chambers while others died of starvation, disease, exhaustion, and executions.

Keep Reading
via Barry Schapiro / Twitter

The phrase "stay in your lane" is usually lobbed at celebrities who talk about politics on Twitter by people who disagree with them. People in the sports world will often get a "stick to sports" when they try to have an opinion that lies outside of the field of play.

Keep Reading
via Stu Hansen / Twitter

In a move that feels like the subject line of a spam email or the premise of a bad '80s movie, online shopping mogul Yusaku Maezawa is giving away money as a social experiment.

Maezawa will give ¥1 million yen ($9,130) to 1,000 followers who retweeted his January 1st post announcing the giveaway. The deadline to retweet was Tuesday, January 7.

Keep Reading