Vertical Aerospace CEO Stephen Fitzpatrick poses for a photograph in London, Britain, October 12, 2021. Picture taken October 12, 2021. REUTERS/Hannah McKay

Vertical Aerospace CEO Stephen Fitzpatrick poses for a photograph in London, Britain, October 12, 2021. Picture taken October 12, 2021. REUTERS/Hannah McKay

Stone wall trees are seen on the vertical surface of historical stone masonry walls built with traditional Chinese wall-making techniques in Hong Kong, China August 31, 2021. Picture taken August 31, 2021. REUTERS/Tyrone Siu

Stone wall trees are seen on the vertical surface of historical stone masonry walls built with traditional Chinese wall-making techniques in Hong Kong, China August 31, 2021. Picture taken August 31, 2021. REUTERS/Tyrone Siu

Stone wall trees are seen on the vertical surface of historical stone masonry walls built with traditional Chinese wall-making techniques in Hong Kong, China August 26, 2021. Picture taken August 26, 2021. REUTERS/Tyrone Siu REFILE - CORRECTING DATE

Stone wall trees are seen on the vertical surface of historical stone masonry walls built with traditional Chinese wall-making techniques in Hong Kong, China August 24, 2021. Picture taken August 24, 2021. REUTERS/Tyrone Siu

Stone wall trees are seen on the vertical surface of historical stone masonry walls built with traditional Chinese wall-making techniques in Hong Kong, China August 24, 2021. Picture taken August 24, 2021. REUTERS/Tyrone Siu

Recently cut-off stone wall trees are seen on the vertical surface of the historical stone masonry walls at the King George V Memorial Park in Hong Kong, China August 24, 2021. Picture taken August 24, 2021. REUTERS/Tyrone Siu

A plaque is partly hidden between the stone wall trees on the vertical surface of the historical stone masonry walls at the King George V Memorial Park in Hong Kong, China August 24, 2021. Picture taken August 24, 2021. REUTERS/Tyrone Siu

The logo of Aeromexico is pictured on the vertical stabilizer of an airplane at the Benito Juarez International airport, in Mexico City, Mexico, July 14, 2021. Picture taken July 14, 2021. REUTERS/Luis Cortes

A prototype of an electrical air-taxi drone by German start-up Volocopter that takes off and lands vertically performs a non-passenger flight over Le Bourget airport, near Paris, France, June 21, 2021. REUTERS/Christian Hartmann

A prototype of an electrical air-taxi drone by German start-up Volocopter that takes off and lands vertically performs a non-passenger flight over Le Bourget airport, near Paris, France, June 21, 2021. REUTERS/Christian Hartmann

A prototype of an electrical air-taxi drone by German start-up Volocopter that takes off and lands vertically performs a non-passenger flight over Le Bourget airport, near Paris, France, June 21, 2021. REUTERS/Christian Hartmann

A prototype of an electrical air-taxi drone by German start-up Volocopter that takes off and lands vertically performs a non-passenger flight over Le Bourget airport, near Paris, France, June 21, 2021. REUTERS/Christian Hartmann

A newly emerged adult cicada searches to climb something vertical for its last molt, as Brood X or Brood 10 cicadas have begun emerging from the earth after 17 years, in Louisville, Kentucky, U.S., May 20, 2021. REUTERS/Amira Karaoud

A view of the Nordic Harvest vertical farm outside Copenhagen, Denmark December 7, 2020. Picture taken December 7, 2020. REUTERS/Tim Barsoe

Coriander grows at the Nordic Harvest vertical farm outside Copenhagen, Denmark December 7, 2020. Picture taken December 7, 2020. REUTERS/Tim Barsoe

A view of the Nordic Harvest vertical farm outside Copenhagen, Denmark December 7, 2020. Picture taken December 7, 2020. REUTERS/Tim Barsoe

A logo of the Nordic Harvest is seen at a vertical farm outside Copenhagen, Denmark December 7, 2020. Picture taken December 7, 2020. REUTERS/Tim Barsoe

A logo of the Nordic Harvest is seen at a vertical farm outside Copenhagen, Denmark December 7, 2020. Picture taken December 7, 2020. REUTERS/Tim Barsoe

A vertical gas flaring furnace is seen in Ughelli, Delta State, Nigeria September 16, 2020. Picture taken September 16, 2020. REUTERS/Afolabi Sotunde

A vertical gas flaring furnace is seen in Ughelli, Delta State, Nigeria September 16, 2020. Picture taken September 16, 2020. REUTERS/Afolabi Sotunde

A vertical gas flaring furnace is seen in Ughelli, Delta State, Nigeria September 16, 2020. Picture taken September 16, 2020. REUTERS/Afolabi Sotunde

General view of a high tech vertical farm where local farmers have a chance to cultivate their crops, despite the nationwide lockdown due to the coronavirus disease (COVID-19) outbreak, in Sharjah, United Arab Emirates April 13, 2020. Picture taken April 13, 2020. REUTERS/Abdel Hadi Ramahi

General view of a high tech vertical farm where local farmers have a chance to cultivate their crops, despite the nationwide lockdown due to the coronavirus disease (COVID-19) outbreak, in Sharjah, United Arab Emirates April 13, 2020. Picture taken April 13, 2020. REUTERS/Abdel Hadi Ramahi

General view of a high tech vertical farm where local farmers have a chance to cultivate their crops, despite the nationwide lockdown due to the coronavirus disease (COVID-19) outbreak, in Sharjah, United Arab Emirates April 13, 2020. Picture taken April 13, 2020. REUTERS/Abdel Hadi Ramahi

General view of a high tech vertical farm where local farmers have a chance to cultivate their crops, despite the nationwide lockdown due to the coronavirus disease (COVID-19) outbreak, in Sharjah, United Arab Emirates April 13, 2020. Picture taken April 13, 2020. REUTERS/Abdel Hadi Ramahi

Crops are seen at Badia Farms, a high tech urban vertical farm, as the city lockdown continues to counter the spread of the coronavirus disease (COVID-19) in Dubai, United Arab Emirates April 12, 2020. Picture taken April 12, 2020. REUTERS/Abdel Hadi Ramahi

Crops are seen at Badia Farms, a high tech urban vertical farm, as the city lockdown continues to counter the spread of the coronavirus disease (COVID-19) in Dubai, United Arab Emirates April 12, 2020. Picture taken April 12, 2020. REUTERS/Abdel Hadi Ramahi

Crops are seen at Badia Farms, a high tech urban vertical farm, as the city lockdown continues to counter the spread of the coronavirus disease (COVID-19) in Dubai, United Arab Emirates April 12, 2020. Picture taken April 12, 2020. REUTERS/Abdel Hadi Ramahi

Drawings of hands and rainbows are seen in a window, as the spread of the coronavirus disease (COVID-19) continues, Antrim, Northern Ireland, April 4, 2020. REUTERS/Jason Cairnduff

A general view of UniCredit Tower and the "Bosco Verticale" (Vertical Forest) residential tower after the Italian government imposed a virtual lockdown on the north of the country, in Milan, Italy March 8, 2020. REUTERS/Flavio Lo Scalzo

The "Bosco Verticale" (Vertical Forest) is seen amidst dense fog and smog in Milan, Italy, January 8, 2020. REUTERS/Flavio Lo Scalzo

The Unicredit Tower and the "Bosco Verticale" (Vertical Forest) are pictured amidst dense fog and smog in Milan, Italy, January 8, 2020. REUTERS/Flavio Lo Scalzo

The Sero, a television that can be viewed horizontally or vertically, is displayed in the Samsung booth during the 2020 CES in Las Vegas, Nevada, U.S. January 7, 2020. REUTERS/Steve Marcus REFILE - CORRECTING TYPO

An Airstream Astrovan II Starliner Crew Transport vehicle drives by launch complex 40 as the Boeing CST-100 Starliner spacecraft, atop an Atlas V rocket, rolls out from the vertical integration facility at the Cape Canaveral Air Force Station in Cape Canaveral, Florida, U.S., December 18, 2019. REUTERS/Steve Nesius

The Boeing CST-100 Starliner spacecraft, atop an Atlas V rocket, rolls out from the vertical integration facility at launch complex 40 at the Cape Canaveral Air Force Station in Cape Canaveral, Florida, U.S., December 18, 2019. REUTERS/Steve Nesius TPX IMAGES OF THE DAY

The Boeing CST-100 Starliner spacecraft, atop an Atlas V rocket, rolls out from the vertical integration facility at launch complex 40 at the Cape Canaveral Air Force Station in Cape Canaveral, Florida, U.S., December 18, 2019. REUTERS/Steve Nesius

An infrared laser, made visible by vapour, is split by a birefringent crystal into one vertical and one horizontal beam, demonstrated with an ArTTA Atom Trap Trace Analysis system currently at the Kirchhoff-Institute for Physics in Heidelberg, Germany, December 7, 2018. Atom Trap Trace Analysis for 39Ar is an ultra-sensitive detection method based on principles of quantum mechanics and found its first application in dating ground water and ice samples. REUTERS/Lisi Niesner

An infrared laser, made visible by vapour, is split by a birefringent crystal into one vertical and one horizontal beam, demonstrated with an ArTTA Atom Trap Trace Analysis system currently at the Kirchhoff-Institute for Physics in Heidelberg, Germany, December 7, 2018. Atom Trap Trace Analysis for 39Ar is an ultra-sensitive detection method based on principles of quantum mechanics and found its first application in dating ground water and ice samples. REUTERS/Lisi Niesner

A deer is seen covered in bracken undergrowth as it prepares to clash with a rival during the rutting season in Richmond Park, west London, Britain, November 12, 2019. REUTERS/Toby Melville

A deer is seen covered in bracken undergrowth as it prepares to clash with a rival during the rutting season in Richmond Park, west London, Britain, November 12, 2019. REUTERS/Toby Melville

A plane with the Mexican colours on its vertical tail is seen at the military airbase of the international airport Silvio Pettirossi, in Luque, Paraguay November 12, 2019. REUTERS/Jorge Adorno

A person takes a picture of Wotruba church as the sun sets in Vienna, Austria November 3, 2019. REUTERS/Leonhard Foeger

An infrared laser, made visible by vapour, is split by a birefringent crystal into one vertical and one horizontal beam, demonstrated with an ArTTA Atom Trap Trace Analysis system at the Kirchhoff-Institute for Physics in Heidelberg, Germany, December 7, 2018. Atom Trap Trace Analysis for 39Ar is an ultra-sensitive detection method based on principles of quantum mechanics. Scientists extract Argon, a Noble Gas, from the air bubbles trapped in the ice. After the extraction, scientists catch and count the rare Ar39 atoms to determine the age of the air and in result the age of the ice. REUTERS/Lisi Niesner SEARCH "AUSTRIA GLACIERS" FOR THIS STORY. SEARCH "WIDER IMAGE" FOR ALL STORIES.

A prototype of an electrical air taxi that takes off and lands vertically (eVTOLs), made by German startup Volocopter, flies during a demonstration round at the Daimler museum in Stuttgart, Germany, September 14, 2019. REUTERS/Michael Dalder

A prototype of an electrical air taxi that takes off and lands vertically (eVTOLs), made by German startup Volocopter, flies during a demonstration round at the Daimler museum in Stuttgart, Germany, September 14, 2019. REUTERS/Michael Dalder

A prototype of an electrical air taxi that takes off and lands vertically (eVTOLs), made by German startup Volocopter, flies during a demonstration round at the Daimler museum in Stuttgart, Germany, September 14, 2019. REUTERS/Michael Dalder

A prototype of an electrical air taxi that takes off and lands vertically (eVTOLs), made by German startup Volocopter, flies during a demonstration round at the Daimler museum in Stuttgart, Germany, September 14, 2019. REUTERS/Michael Dalder

A prototype of an electrical air taxi that takes off and lands vertically (eVTOLs), made by German startup Volocopter, flies during a demonstration round at the Daimler museum in Stuttgart, Germany, September 14, 2019. REUTERS/Michael Dalder

A prototype of an electrical air taxi that takes off and lands vertically (eVTOLs), made by German startup Volocopter, flies during a demonstration round at the Daimler museum in Stuttgart, Germany, September 14, 2019. REUTERS/Michael Dalder

A prototype of an electrical air taxi that takes off and lands vertically (eVTOLs), made by German startup Volocopter, flies during a demonstration round at the Daimler museum in Stuttgart, Germany, September 14, 2019. REUTERS/Michael Dalder

A prototype of an electrical air taxi that takes off and lands vertically (eVTOLs), made by German startup Volocopter, flies during a demonstration round at the Daimler museum in Stuttgart, Germany, September 14, 2019. REUTERS/Michael Dalder

A prototype of an electrical air taxi that takes off and lands vertically (eVTOLs), made by German startup Volocopter, flies during a demonstration round at the Daimler museum in Stuttgart, Germany, September 14, 2019. REUTERS/Michael Dalder

Resident buildings and offices are seen in Shenzhen, Guangdong Province, China, September 6, 2019. Picture taken September 6, 2019. REUTERS/Athit Perawongmetha

Russia's Soyuz-FG booster rocket with the Soyuz MS-13 spacecraft for the new International Space Station (ISS) crew, comprising NASA astronaut Andrew Morgan, Luca Parmitano of ESA (European Space Agency) and Alexander Skvortsov of the Russian space agency Roscosmos, is mounted vertical at the launch pad at the Baikonur Cosmodrome, Kazakhstan, July 18, 2019. Dmitri Lovetsky/Pool via REUTERS

Russia's Soyuz-FG booster rocket with the Soyuz MS-13 spacecraft for the new International Space Station (ISS) crew, comprising NASA astronaut Andrew Morgan, Luca Parmitano of ESA (European Space Agency) and Alexander Skvortsov of the Russian space agency Roscosmos, is mounted vertical at the launch pad at the Baikonur Cosmodrome, Kazakhstan, July 18, 2019. Dmitri Lovetsky/Pool via REUTERS

Chef and Plenty advisory board member Nancy Silverton prepares a salad during a demonstration in San Francisco, California, U.S., June 11, 2019. Picture taken June 11, 2019. REUTERS/Jane Lanhee Lee

Plenty CEO and co-founder Matt Barnard tastes a salad prepared by chef and Plenty advisory board member Nancy Silverton during a demonstration in San Francisco, California, U.S., June 11, 2019. Picture taken June 11, 2019. REUTERS/Jane Lanhee Lee

Apollo Aquaculture Group CEO Eric Ng checks on his fish at his prototype vertical fish farm in Singapore May 17, 2019. Picture taken May 17, 2019. REUTERS/Edgar Su