reach new hiekts. take a look at this vertical forest. proposed to be built in nanjing will be coated with trees and shrubs. the cascading plants of varying species will combat pollution by providing 25 tons off co2 absorption every year, producing more than 130 pounds of oxygen every day. and this is isn't the only carbon-eating building in the region. construction on this plant-covered residential complex in taipei will be completed this fall. so it seems this is just the beginning of tree buildings growing in china. in fact, the architect unveiled plans for a forest city as the guardian pointed out. here's hoping urban china will one day be blanketed by green shrubs and trees, not gray smog and toxins. the correct answer to the gps challenge question is a. between 2012 and 2016, india accounted for 13% of global arm