Supper trees:
Supper trees are located in Garden by the Bay in Singapore. Apart from different planting on these trees,they help to make the garden more environmentally sustainable. Some functions of these trees are like real trees. Real trees have a process called photosynthesise. In this process trees absorb sunlight,water and carbon dioxide and produce carbohydrate and oxygen ( NSTA 2014). Supper trees absorb sunlight by photovoltaic cells to produce electricity for lighting and also gather the rain water for plants in garden. Furthermore it can moderate the temperature by absorbing and releasing air. They also provide shadow for visitors (CNN 2012). These structures are the good examples of  imitating the nature to provide sustainable environment. They act like trees which are effective to alleviate air pollution and global warming.

http://www.skyscrapercity.com/showthread.php?t=1643309&page=2

http://designlike.com/2012/08/02/incredible-futuristic-gardens-by-the-bay-in-singapore/

http://www.factmonster.com/ipka/A0775714.html

Source:
http://edition.cnn.com/2012/06/08/world/asia/singapore-supertrees-gardens-bay/
http://biology.clc.uc.edu/courses/bio104/photosyn.htm