South Asia's urban population grew by 130 million between 2001 and 2011—more than the entire population of Japan—and is poised to rise by almost 250 million by 2030.[46] But, urbanisation in South Asia is characterized by higher poverty, slums, pollution and crowding and congestion.[47] At least 130 million South Asians—more than the entire population of Mexico—live in informal urban settlements characterized by poor construction, insecure tenure and underserviced plots.[46] Despite being a water-rich zone, climate projection models suggest that by 2050, between 52 and 146 million people living in South Asia could face increased water scarcity due to climate change, accounting for 18% of the global population exposed to water scarcity.[48] Urban water access is particularly critical in South Asia as it remains home to more than 40% of the world's poor (living on less than US$1.25 per day) and 35% of the world's undernourished.[49] A study done of selected Himalayan cities in India and Nepal found that none of them have a robust system of water planning and governance to tackle the water challenges emerging from rapid urbanization and climate change.[50] Khulna, Bangladesh is also facing many issues surrounding water insecurity as well. As sea levels begin to rise, due to climate change, salinity will move inwards, reducing the amount of safe drinking water available to the people of Khulna. There are plans being put in place to make the quality of water in cities better, but this decreases the availability to those in the informal urban areas.