PARIS  Imagine gliding in a floating hotel over the Serengeti, gazing down at herds of zebra or elephants; or floating over Paris as the sun sets and lights blink on across the city as you pass the Eiffel Tower.

Such flights of fancy may one day be possible, if the dream of Jean-Marie Massaud, a French architect, comes true.

As the cost of fuel soars and the pressure mounts to reduce carbon dioxide emissions, several schemes for a new generation of airship are being considered by governments and private companies. “It’s a romantic project,” said Mr. Massaud, 45, sitting amid furniture designs in his Paris studio, “but then look at Jules Verne.”

It has been more than 70 years since the giant Hindenburg zeppelin exploded in a spectacular fireball over Lakehurst, N.J., killing 36 crew members and passengers, abruptly ending an earlier age of airships. But because of new materials and sophisticated means of propulsion, a diverse cast of entrepreneurs is taking another look at the behemoths of the air.