Countless ships traverse the world’s oceans, transporting humans and goods. Most ships burn heavy fuel oil, and so produce large amounts of fine particulates. But some ships are powered with liquid gas, or LNG, which dramatically cuts emissions.
We must wean ourselves off unsustainable economic growth if we are to cut greenhouse gas emissions and avoid catastrophic climate change, say some economists. But what are the alternatives to growth?
Drivers of older, more polluting diesel and petrol vehicles have to pay almost twice as much to drive in central London, after the city administration has introduced a so-called "T-charge" to improve air quality.
There's massive public worry about diesel car emissions these days - but the really big polluters are plying our waters.
Nitrogen oxide (NOx) emissions were at the center of the Dieselgate scandal that swamped Volkswagen two years ago, but the carmaker's head of development says that problem is solved with its latest engines.
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