LONDON, UNITED KINGDOM - APRIL 21: People walk under fully bloomed cherry blossom trees at Greenwich Park in London, England as temperature hits 17 C on April 21, 2015. (Photo by Tolga Akmen/Anadolu Agency/Getty Images)
LONDON, UNITED KINGDOM - APRIL 21: People walk under fully bloomed cherry blossom trees at Greenwich Park in London, England as temperature hits 17 C on April 21, 2015. (Photo by Tolga Akmen/Anadolu Agency/Getty Images)