Traffic moves under a bridge displaying a banner from the monsoon tree plantation campaign in Karachi, Pakistan July 5, 2022. Karachi is a sprawling port city of some 17 million people, where breakneck expansion of roads and buildings means there is less and less space for trees and parkland. REUTERS/Akhtar Soomro SEARCH "SOOMRO PAKISTAN FOREST" FOR THIS STORY. SEARCH "WIDER IMAGE" FOR ALL STORIES.