More than a century since humans learned to fly, we need to revolutionise how we stay up there, say two experts in urban planning.
SHEFFIELD, United Kingdom: If the aviation industry was a country, it would rank among the world’s top ten emitters of carbon dioxide .
Every person could be allocated a maximum number of “flight kilometres” each year. This allowance would increase the longer a person abstained from flying. Expanded and improved high-speed rail lines could also replace many flights. These journeys could be as fast as aeroplanes in some instances and emit 90 per cent less CO2.
The fossil fuel costs of small aircraft are about US$400 per 160km. For Alice, the costs are projected to be as little as US$8 for the same distance, and if the electricity is from renewable energy – perhaps generated by solar panels at the airport – then the plane could be zero-carbon.How much energy each battery can store is increasing rapidly. But there are also strategies which can make electric planes more efficient.
The balloons of most modern airships are filled with helium rather than the explosive hydrogen used in the Hindenburg. Concentrated helium is lighter than air and when divided into gas sacks, the vessel can stay aloft if any are breached while propellers powered by flexible solar panels can help navigation.
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