The report, a copy of which was made available to the News Agency of Nigeria (NAN) in Abuja, noted that urban development farther inland increased the water demand upstream.
It further noted that many rivers, including the Nile, no longer reached their deltas.
According to the report, migration in many coastal cities has increased as populations are exposed to rising sea levels, storm surges and floods.
“Low elevation coastal zones are at risk from rising sea levels and coastal surges are home to about 600 million people globally and 15 of the world’s 20 megacities.
“Half the world’s populations now live in the cities, a share that would rise to 70 per cent by 2050,’’ it said.
Furthermore, the report stated that climate change was one of many factors that determined urban vulnerability.
The report said that a number of countries were looking into new urban development strategies that aimed at spreading regional prosperity.
According to the report, many of these efforts focus on technological innovation and offer new opportunities to re-design future cities to deal with climate change challenges.
