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But the number of dolphins in Hong Kong have declined as much as 80 percent over the past 15 years, according to a report by 15 conservation groups and regional universities, as pollution, marine traffic and large-scale land reclamation projects have made the environment increasingly hostile.

The construction of a new runway for Hong Kong’s international airport and a bridge that links the city with the western side of the Pearl River has also disrupted areas that were once prime dolphin habitat but now rarely see the animals.

“If we identify individuals, we can follow their life history — where they like to hang around, whether they have calves,” he said. “This is important, because one of the worries is reproductive rate of dolphins is quite low. To keep the population healthy, we want to see calves. But that’s not happening in Hong Kong.”

“What we have documented fairly clearly is that dolphins are moving back out into the ferry zone,” Mr. McCook said. “That actually is their most prime habitat under current circumstances.”

“People want to hear this news about the benefit of the pandemic for wildlife, but it’s not true for dolphins,” said Vincent Ho, the vice chairman of the Hong Kong Dolphin Conservation Society.

“Every time we have a project like the bridge,” Mr. Ho said, “they set up a marine park as some kind of compensation. But we think it’s too late.”

“All vessel traffic is an issue, but high-speed ferries are a particular issue,” said Laurence McCook, the head of oceans conservation for the WWF-Hong Kong. “They move so fast there’s a risk of vessel strike, but they also just physically disturb the dolphins because the dolphins run away from them.”

Conservation groups say they hope the benefits of the ferry suspension will encourage regional governments and ferry companies to reconsider routes across the Pearl River. By traveling somewhat farther south, they could bypass key areas of dolphin habitat along Lantau, Hong Kong’s largest island.

“Rerouting the ferries is not a magic cure-all,” Mr. McCook said. “But we think that can help us catalyze other actions and demonstrate it’s not a fait accompli that we lose the dolphins.”

According to the UK charity Whale and Dolphin Conservation, there are at least 3,000 cetaceans - the group of "toothed whales" that dolphins belong to - in captivity in 50 countries around the world.

In addition, in the more than 150 years since the first whales and dolphins were brought from the wild and into aquariums, scientists have learned a huge amount about their intelligence and complex social lives.

Oceans serve as a good indicator of the real impact of climate change. Covering almost three quarters of Earth's surface, they absorb the vast majority of the world's heat. Since 1970, more than 90% of the planet's excess heat went into the oceans, while less than 4% was absorbed by the atmosphere and the land, the study said.

Rising temperatures also mean ocean waters have less oxygen and are becoming more acidic, which has a major impact on nutrients that feed marine wildlife. For example, when an ocean heat wave struck the waters of Western Australia in 2011, scientists noticed there were fewer dolphin births and the animal's survival rate dropped.

"If the leaders of the world changed course, a revolution could take place over about 15 years ... this requires the leaders of China, and the US in particular, along with Europe, to take a strong leadership role and set the stage for the rest of the world to follow," he said.

Some researchers believe that the introduction of seafood into the diet of early modern humans helped their cognitive development because of Omega-3 fatty acids and other brain-boosting nutrients. That contributed to cultural and technological developments that led them to migrate out of Africa and spread across the globe.

Zilhão published a study two years ago about 65,000-year-old cave paintings found in three caves on the Iberian Peninsula that are credited to Neanderthals. This aligns with another discovery of pendants and shells colored with pigments, also thought to be the work of Neanderthals.

Earlier this year, a separate analysis of clam shells and volcanic rocks from an Italian cave shows that Neanderthals collected shells and pumice from beaches. And due to specific indicators on some of the shells, the researchers also believe Neanderthals waded and dove into the ocean to retrieve shells, meaning they may have been able to swim.

The cost: The participating counties and municipalities are contributing to a $4bn statewide spend, including Miami Beach’s $400m Forever Bond, a $1bn stormwater plan and $250m of improvements to Broward county’s sewage systems to protect against flooding and seawater seepage. In the Keys, many consider the estimated $60m a mile cost of raising roads too expensive.

The threat: Saltwater from sea level rise is seeping further inland through Florida’s porous limestone bedrock and contaminating underground freshwater supplies, notably in the Biscayne aquifer, the 4,000-sq mile shallow limestone basin that provides drinking water to millions in southern Florida. Years of over-pumping and toxic runoff from farming and the sugar industry in central Florida and the Everglades have worsened the situation. The Florida department of environmental protection warned in March that “existing sources of water will not adequately meet the reasonable beneficial needs for the next 20 years”. A rising water table, meanwhile, has exacerbated problems with south Florida’s ageing sewage systems. Since December, millions of gallons of toxic, raw sewage have spilled on to Fort Lauderdale’s streets from a series of pipe failures.

The cost: The Everglades restoration plan was originally priced at $7.8bn, rose to $10.5bn, and has since ballooned to $16.4bn. Donald Trump’s proposed 2021 federal budget includes $250m for Everglades restoration. The estimated $1.8bn cost of the reservoir will be split between federal and state budgets.

Possible solutions

The cost: With homeowners and businesses largely bearing their own costs, the specific amount spent on “hurricane-proofing” in Florida is impossible to know. A 2018 Pew research study documented $1.3bn in hazard mitigation grants from federal and state funding in 2017, along with a further $8bn in post-disaster grants. Florida is spending another $633m from the US Department of Housing and Urban Development on resiliency planning.

Wildlife and habitat loss The threat: Florida’s native flora and fauna are being devastated by climate change, with the Florida Natural Areas Inventory warning that a quarter of the 1,200 species it tracks is set to lose more than half their existing habitat, and the state’s beloved manatees and Key deer are at risk of extinction. Warmer and more acidic seas reduce other species’ food stocks and exacerbate the deadly red-tide algal blooms that have killed incalculable numbers of fish, turtles, dolphins and other marine life. Bleaching and stony coral tissue disease linked to the climate crisis threaten to hasten the demise of the Great Florida Reef, the only living coral reef in the continental US. Encroaching saltwater has turned Big Pine Key, a crucial deer habitat, into a ghost forest.

As for the Key deer, of which fewer than 1,000 remain, volunteers leave clean drinking water to replace salt-contaminated watering holes as herds retreat to higher ground. A longer-term debate is under way on the merits and ethics of relocating the species to other areas of Florida or the US.

Coastal erosion The threat: Tourist brochures showcase miles of golden, sandy beaches in South Florida, but the reality is somewhat different. The Florida department of environmental protection deems the entire coastline from Miami to Cape Canaveral “critically eroded”, the result of sea level rise, historically high tides and especially storm surges from a succession of powerful hurricanes. In south-eastern Florida’s Palm Beach, Broward, Miami-Dade and Monroe counties, authorities are waging a continuous war on sand loss, eager to maintain their picture-perfect image and protect two of their biggest sources of income, tourism dollars and lucrative property taxes from waterfront homes and businesses.

In the devastating hurricane season just one year before, major storms named Harvey, Maria and Irma combined to cause damage estimated at $265bn. Scientists have evidence the climate crisis is causing cyclones to be more powerful, and intensify more quickly, and Florida’s position at the end of the Atlantic Ocean’s “hurricane alley” makes it twice as vulnerable as any other state.

With the other option abandoning beaches to the elements, city and county commissions have little choice but costly replenishment projects with sand replacement and jetty construction. Federal law prohibits the importation of cheaper foreign sand, so the municipalities must source a more expensive alternative from US markets, often creating friction with residents who don’t want to part with their sand. Supplementary to sand replenishment, the Nature Conservancy is a partner in a number of nature-based coastal defense projects from West Palm Beach to Miami.

benefited from 61,000 cubic yards of new sand this year at a cost of $16m. Statewide, Florida spends an average $50m annually on beach erosion.

The threat: “Climate gentrification” is a buzzword around south Florida, a region barely 6ft above sea level where land has become increasingly valuable in elevated areas. Speculators and developers are eyeing historically black, working-class and poorer areas, pushing out long-term residents and replacing affordable housing with upscale developments and luxury accommodations that only the wealthy can afford.

No study has yet calculated the overall cost of affordable housing lost to the climate crisis. Private developers will bear the expense of mitigating the impact on the neighborhood – $31m in Magic City’s case over 15 years to the Little Haiti Revitalization Trust, largely for new “green” affordable housing. The University of Miami’s housing solutions lab has a $300,000 grant from JPMorgan to report on the impact of rising seas to South Florida’s affordable housing stocks and recommend modifications to prevent it from flooding and other climate events. A collaboration of not-for-profit groups is chasing $75m in corporate funding for affordable housing along the 70-mile south Florida rail trail from Miami to West Palm Beach, with the first stage, a $5m project under way to identify, build and renovate 300 units.

Florida has long been plagued by political leadership more in thrall to the interests of big industry than the environment. As governor from 2011 to 2019, Rick Scott, now a US senator, slashed $700m from Florida’s water management budget, rolled back environmental regulations and enforcement, gave a free ride to polluters, and flip-flopped over expanding offshore oil drilling. The politician who came to be known as “Red Tide Rick”, for his perceived inaction over 2018’s toxic algae bloom outbreaks, reportedly banned the words “climate change” and “global warming” from state documents.

Last month, state legislators approved the first dedicated climate bill. It appears a promising start for a new administration, but activists say more needs to be done. In January, the Sierra Club awarded DeSantis failing grades in an environmental report card, saying he failed to protect Florida’s springs and rivers and approved new roads that threatened protected wildlife.

The cost: Florida’s spending on the environment is increasing. The state budget passed last month included $650m for Everglades restoration and water management projects (an instalment of DeSantis’s $2.5bn four-year pledge) and $100m for Florida Forever. A $100m bridge project jointly funded by the state and federal governments will allow the free flow of water under the Tamiami Trail for the first time in decades.

Florida has woken up to the threat of climate change but it is not yet clear how effective the response will be. The challenges are innumerable, the costs immense and the political will to fix or minimize the issues remains questionable, despite recent progress. At stake is the very future of one of the largest and most diverse states in the nation, in terms of both its population and its environment. Action taken now will determine its survival.

Their culture is matrilinear, and information about the new dangers may have been passed on in the same way whale matriarchs share knowledge about feeding grounds.

Sperm whales are highly socialised animals, able to communicate over great distances. They associate in clans defined by the dialect pattern of their sonar clicks

It was a frighteningly rapid killing, and it accompanied other threats to the ironically named Pacific. From whaling and sealing stations to missionary bases, western culture was imported to an ocean that had remained largely untouched

Sperm whales also possess the largest brain on the planet. It is not hard to imagine that they understood what was happening to them.

The hunters themselves realised the whales’ efforts to escape. They saw that the animals appeared to communicate the threat within their attacked groups. Abandoning their usual defensive formations, the whales swam upwind to escape the hunters’ ships, themselves wind-powered. ‘This was cultural evolution, much too fast for genetic evolution,’

Now, just as whales are beginning to recover from the industrial destruction by 20th-century whaling fleets – whose steamships and grenade harpoons no whale could evade – they face new threats created by our technology. ‘They’re having to learn not to get hit by ships, cope with the depredations of longline fishing, the changing source of their food due to climate change,’ says Whitehead

Perhaps the greatest modern peril is noise pollution, one they can do nothing to evade.

Whitehead and Randall have written persuasively of whale culture, expressed in localised feeding techniques as whales adapt to shifting sources, or in subtle changes in humpback song whose meaning remains mysterious. The same sort of urgent social learning the animals experienced in the whale wars of two centuries ago is reflected in the way they negotiate today’s uncertain world and what we’ve done to it.

The Galápagos, once a destination for only well-off travelers unfazed by the islands’ remote location, had seen an increase in tourism before the coronavirus pandemic, with visitor numbers jumping 90 percent between 2007 and 2016.

In 2018, a group of tour operators expressed concern about the influx of tourists, saying they could harm not just the wildlife but the islands’ landscapes and beaches.