Whales are celebrated for being the largest and most intelligent creatures in the ocean. Now, biologists have discovered that they also capture（捕获） tons of carbon from the atmosphere, a service with an economic value of US $1 trillion for all the great whales, according to a new study published by the International Monetary Fund. The study points out that protecting whales, normally viewed as a human good, also has a monetary motivation.
"The carbon capture potential of whales is truly incredible," said the report. "Our conservative estimates put the value of the average great whale at more than US $2 million, and easily over US $1 trillion for the current stock of great whales." Whales absorb carbon in their bodies during their long lives, some of which stretch to 200 years. When they die, they sink to the bottom of the ocean, taking the carbon with them. According to the study, each great whale traps around 33 tons of carbon dioxide on average. A tree during the same period only contributes to 3percent of the carbon absorption of the whale.
Whale populations are today a smidgen of what they once were. It is estimated that there are slightly more than 1.3 million whales in the ocean, a quarter of their pre-whaling number of 4 t o5 million. Some species in particular, like the blue whale, are only 3 percent of what they used to be. "We can create financial methods to promote the restoration of the world's whale populations," said the report's authors. "Rewards could help those who pay significant costs as a result of whale protection."
With the Paris Agreement coming into force next year and the effects of climate change ever more widespread, we must prevent the harm to whales. Researchers analyzed that unless new methods are put forward, it would take over 30 years to double the number of current whales, and several generations to return them to their pre-whaling numbers. "Society and our own survival can't afford to wait this long," they said.
