Longchamp Racecourse: Parisian ‘green bubble’ almost complete

Japanese horse race fans cheer up before the start of the 2,400-metre (1.5 mile) Japan Cup horse race at the Tokyo Race Course on November 25, 2012. Gentildonna edged past Prix de l'Arc de Triomphe runner-up Orfevre by a nose to become the first three-year-old filly to win the Japan Cup horse racing. AFP PHOTO / KAZUHIRO NOGI (Photo credit should read KAZUHIRO NOGI/AFP via Getty Images)

Jockey Frankie Dettori, on his horse Enable, races to win the 96th Qatar Prix de l'Arc de Triomphe horse race at the Chantilly racecourse, north of Paris on October 1, 2017. Frankie Dettori won a record fifth Prix de l'Arc de Triomphe as 10-11 favourite Enable stormed to victory at Chantilly. The three-year-old John Gosden-trained filly Enable got off to a fast start and was perfectly placed when Dettori unleashed her in the home straight to easily beat Cloth of Stars (25-1) into second by two and a half lengths, with Michael Stout's Ulysses (9-1) third. / AFP PHOTO / Thomas SAMSON (Photo credit should read THOMAS SAMSON/AFP/Getty Images)

ASCOT, ENGLAND - JUNE 20: A guest on day three, Ladies Day, of Royal Ascot at Ascot Racecourse on June 20, 2019 in Ascot, England. (Photo by Chris Jackson/Getty Images)

KILDARE, IRELAND - MAY 19: Queen Elizabeth II and Prince Philip, Duke of Edinburgh during a visit to the Irish National Stud, one of Ireland's top horsebreeding centres, during the third day of the state visit to Ireland, on May 19, 2011 in Kildare, Ireland. The Duke and Queen's visit to Ireland is the first by a monarch since 1911. An unprecedented security operation is taking place with much of the centre of Dublin turning into a car free zone. Republican dissident groups have made it clear they are intent on disrupting proceedings. (Photo by John Stillwell - Pool/Getty Images)

DUBLIN, IRELAND - SEPTEMBER 15: Oisin Murphy riding Roaring LIon (L, red) win The QIPCO Irish Champion Stakes from Ryan Moore and Saxon Warrior (R) at Leopardstown Racecourse on September 15, 2018 in Dublin, Ireland. (Photo by Alan Crowhurst/Getty Images)

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ASCOT, ENGLAND - JUNE 21: A racegoer wears an outsize hat for Ladies Day during Royal Ascot Day 3 at Ascot Racecourse on June 21, 2018 in Ascot, United Kingdom. Royal Ascot is Britain's most valuable race meeting, attracting many of the world's finest racehorses to compete for more than £7.3m in prize money. (Photo by Leon Neal/Getty Images)

ELMONT, NY - JUNE 06: Triple Crown and Belmont Stakes contender Justify is walked in his barn by trainer Bob Baffert after arriving prior to the 150th running of the Belmont Stakes at Belmont Park on June 6, 2018 in Elmont, New York. (Photo by Al Bello/Getty Images)

BALTIMORE, MD - MAY 16: Trainer Bob Baffert walks Kentucky Derby winner Justify in the barn after the horse arrived at Pimlico Race Course for the upcoming Preakness Stakes on May 16, 2018 in Baltimore, Maryland. (Photo by Rob Carr/Getty Images)

LOUISVILLE, KENTUCKY - MAY 04: Jockey Flavien Prat celebrates atop of Country House #20 after winning the 145th running of the Kentucky Derby at Churchill Downs on May 04, 2019 in Louisville, Kentucky. (Photo by Andy Lyons/Getty Images)

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Jockey Christophe Soumillon rides Thunder Snow across the finish line to win the Dubai World Cup horse race at the Dubai World Cup in the Meydan Racecourse on March 31, 2018 in Dubai. / AFP PHOTO / GIUSEPPE CACACE (Photo credit should read GIUSEPPE CACACE/AFP/Getty Images)

Franco Moro marginally leads the field in a skijoring race in St Moritz.

Competitors take part in the Skikjoering race at the White Turf horse racing event held on the frozen lake of the Swiss mountain resort of St. Moritz on February 17, 2019. - More images can be found on www.afpforum.com. Search slug: HORSE-RACING-SWITZERLAND (Photo by STEFAN WERMUTH / AFP) (Photo credit should read STEFAN WERMUTH/AFP/Getty Images)

LONDON, ENGLAND - FEBRUARY 12: Polo equiptment lies on the ground as children from the Ebony Horse Club in Brixton are given Polo lessons at the newly launched Moor Hall Farm (MHF) Polo Club on February 12, 2018 in London, England. Professional England Polo players and coaches, Alec and Edward Banner-Eve, visited the MHF Docklands centre as part of an initiative to give children their first experience of Polo. Ebony Horse Club sits in the heart of Brixton, South East London, one of the most disadvantaged inner city neighborhoods in the country. The club focuses on the use of horses as a means of therapy, and provides a positive experience for young, often socially disadvantaged children, who otherwise would have little or no contact with animals, especially horses. (Photo by Dan Kitwood/Getty Images)

LOUISVILLE, KY - MAY 05: Roses are seen from the winner's circle prior to the the 138th running of the Kentucky Derby at Churchill Downs on May 5, 2012 in Louisville, Kentucky. (Photo by Jamie Squire/Getty Images)

HONG KONG, HONG KONG - DECEMBER 05: Silvestre De Sousa representing Great Britain poses with the trophy after winning championship during the LONGINES International Jockeys' Championship at Happy Valley Racecourse on December 05, 2018 in Hong Kong. (Photo by Vince Caligiuri/Getty Images)

LAYTOWN, IRELAND - SEPTEMBER 08: Racegoers shelter from the rain as the runners pass during the Laytown race meeting run on the beach on September 08, 2011 in Laytown, Ireland. (Photo by Alan Crowhurst/Getty Images)

SYDNEY, NEW SOUTH WALES - APRIL 08: Winx and jockey Hugh Bowman cross the line to win the Queen Elizabeth Stakes at Royal Randwick Racecourse on April 8, 2017 in Sydney, Australia. (Photo by Brook Mitchell/Getty Images for The ATC)