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Operators of the 60 000 to 90 000 oil tankers, bulk carriers, ferries and other huge cargo ships plying the seas are racing to find alternatives to fuel oil as pollution rules are tightened. The industry generates roughly three percent of Earth-warming greenhouse gas emissions worldwide, a figure that experts say could reach 17% by 2050 if nothing is done.

starting January 1, levels of air-polluting sulphur in marine fuel must be below 0.5 percent, according to new International Maritime Organisation standards — a sharp drop from today’s 3.5%

Beside sails, some firms have designed huge kites that pull cargo ships, though just a few operators have adopted the system.

Another option is to use “Flettner rotors” like those built by Norsepower of Finland, employing a technology developed by German engineers in the 1920s.The tall columns are installed on a ship and set spinning, creating lift that propels a ship forward when they catch a perpendicular wind.

wind advocates say tighter pollution rules — potentially including more widespread taxes on carbon emissions — will force shipping firms to clean up their act

The Orchestra was escorted outside the port not just by small vessels protesting but by tugboats that saluted it with water sprays, a sea tradition reserved for special occasions.The 16-deck ship can carry over 3,000 passengers and 1,000 crew but for this voyage will be sailing at only half capacity due to COVID-19 social distancing rules."It's an important day for us, for 4,000 workers and many others who work in this sector. We are starting again after over 17 months, finally there is light at the end of the tunnel," said Alessandro Santi, chairman of the Federlogistica business group.

cruise business represents more than 3% of Venice's GDP

Potential pollution also poses a risk, as the project entails the construction of enlarged waterways connecting the Black Sea, the Sea of Marmara and the Mediterrean Sea. 

Prior projects include a massive third suspension bridge across the Bosphorus, and a new airport covering an area more than twice the size of Manhattan.

“Things like climate change, earthquakes, drought — they are of course realities of our lives,” Durusu-Tanrıöver said. “But there are human actions that can be taken to foresee what will happen and behave accordingly.

In the half-century leading up to empire’s collapse, the scientists found, the rings inside the tree trunks gradually start to get narrower — suggesting that water shortages were limiting the junipers’ growth. Chemical analyses of the kind of carbon captured in the wood also showed how drought altered the trees at the cellular level.

cuneiform tablets from that time in which Hittite officials fretted over rising food prices and asked for grain to be sent to their cities. But Manning said the empire — which was known for its elaborate water infrastructure projects and massive grain silos in major cities — should have been able to survive this “low frequency” drought.

Durusu-Tanrıöver blames an unsustainable economy and centralized political system. The intensive agricultural practices required to support the capital city probably exhausted the region’s water resources and weakened surrounding ecosystems

“Very few societies ever plan for more than one or two disasters happening consecutively.”

“But I think it’s naive to believe that three years of drought would bring down the storerooms of the Hittite empire,” Weiss said. He argues that the longer-term drying trend, which has been documented in other studies, was probably more significant.

“What’s a crisis for some becomes almost an opportunity for others,” Manning said. “You have adaptation and resilience in the form of new states and new economies emerging.”

between 1198 and 1196 B.C., the region was struck by three of the driest years in the entire 1,000-year-long tree ring record. The abrupt spurt of intensely dry weather may have been more than the Hittites could bear. Within a generation, the empire had dissolved.

parallels to modern urban areas, which are both major sources of planet-warming pollution and especially vulnerable to climate change impacts like extreme heat.