On April 1, 2012, a Chinese woman on her way to work suddenly felt the earth beneath her crumble and, in an instant, found herself plunging into an abyss of scalding hot water. The woman had unknowingly stepped into one of the many sinkholes appearing in China’s megacities. The emergence of sinkholes in China is part of a larger set of environmental issues related to rapid urbanization taking place in the Asia-Pacific region overall. [Video Below]

Eight years from now, the Gaza Strip will have “virtually no reliable access to sources of safe drinking water, standards of healthcare and education will have continued to decline, and the vision of affordable and reliable electricity for all will have become a distant memory for most,” according to a United Nations report released last month. The bleak assessment concludes that without immediate action to address immense and interconnected economic, demographic, environmental, infrastructure, and social challenges facing Gazans, “the already high number of poor, marginalized and food-insecure people depending on assistance will not have changed, and in all likelihood will have increased.”

Following the steady economic growth that many African countries have experienced in recent years and continued population growth, urbanization has accelerated rapidly on the continent as people turn to cities to take advantage of new economic opportunities. But growing cities have led to another problem. According to a new Food and Agriculture Organization (FAO) report, Growing Greener Cities in Africa, urban populations are exceeding the capacity of African cities to provide food for them, putting nearly 300 million people at risk of hunger and malnutrition, and greener strategies – urban agriculture and better water use – could help considerably.

“Over the past several months, extreme weather and climate events seemed to have become the norm rather than the exception,” writes Kelly Levin for the World Resources Institute (WRI). Indeed, records have been broken around the world as countries experience unprecedented heat, drought, flooding, or other types of severe weather. And people are starting to take notice. A number of recent stories try to make sense of this wild weather and what, if anything, it has to do with climate change.

Twenty-five years have passed since the Brundtland Commission first brought sustainable development to international prominence. Today, the United Nations appears on track to replace the soon-to-expire Millennium Development Goals with “Sustainable Development Goals,” marking the extent to which the international community has embraced the concept. And yet, in spite of its prominence, a specific and measureable definition of sustainability remains lacking.

The number of urban slum dwellers worldwide is staggering. According to UN-Habitat, 827.6 million people live in slums around the world. Despite meeting a Millennium Development Goal to significantly improve the lives of at least 100 million slum dwellers by 2020, the total number of people living in these areas still increased by 55 million between 2000 and 2010. By 2020, the world slum population is projected to reach 889 million. With the majority of people now living in cities, urban priorities are synonymous with human security and environmental sustainability and must be accounted for in the global development agenda.

The challenges for cities in the coming century will be many, but accounting for swelling numbers of new residents – due to more open avenues of communication and flows of goods, economic opportunity, population growth, and potential climate change-induced displacement – is perhaps the biggest.

Urbanization and climate change may be the two most important trends to shape global development in the decades ahead. On the one hand, urban cities have the potential to serve as engines of change, driving economic growth in some of the world’s least developed countries and pulling more people out of poverty than at any other time in history. On the other hand, climate change could undercut all of this by exacerbating resource scarcity and putting vulnerable communities at risk from sea level rise and more frequent and intense storms.