which is the tallest tower in both Japan and the world, and the second tallest structure in the world after the Burj Khalifa in Dubai. Mori Building Co started work on Tokyo's new tallest building which is set to be finished in March 2023. The project will cost 580 billion yen ($5.5 billion). Tokyo contains numerous parks and gardens. There are four national parks in Tokyo Prefecture, including the Fuji-Hakone-Izu National Park, which includes all of the Izu Islands. Environment Tokyo has enacted a measure to cut greenhouse gases. Governor Shintaro Ishihara created Japan's first emissions cap system, aiming to reduce greenhouse gas emission by a total of 25% by 2020 from the 2000 level. Tokyo is an example of an urban heat island, and the phenomenon is especially serious in its special wards. According to the Tokyo Metropolitan Government, the annual mean temperature has increased by about over the past 100 years. Tokyo has been cited as a "convincing example of the relationship between urban growth and climate". In 2006, Tokyo enacted the "10 Year Project for Green Tokyo" to be realized by 2016. It set a goal of increasing roadside trees in Tokyo to 1 million (from 480,000), and adding of green space, of which will be a new park named "Umi no Mori" (Sea Forest) which will be on a reclaimed island in Tokyo Bay which used to be a landfill. From 2007 to 2010, of the planned 1,000 ha of green space was created and 220,000 trees were planted, bringing the total to 700,000. , roadside trees in Tokyo have increased to 950,000, and a further of green space has been added. Demographics As of October 2012, the official intercensal estimate showed 13.506 million people in Tokyo, with 9.214 million living within Tokyo's 23 wards. During the daytime, the population swells by over 2.5 million as workers and students commute from adjacent areas. This effect is even more pronounced in the three central wards of Chiyoda, Chūō, and Minato, whose collective population as of the 2005 National Census was 326,000 at night, but 2.4 million during the day. In 1889, the Home Ministry recorded 1,375,937 people in Tokyo City and a total of 1,694,292 people in Tokyo-fu. In the same year, a total of 779 foreign nationals were recorded as residing in Tokyo. The most common nationality was English (209 residents), followed by American (182) and