A refugee in the traditional vision is someone who flees from country to another because of persecution or conflict. But what we're witnessing now more and more is a certain number of mega-trends interacting with one another: population growth, urbanization, food insecurity, water scarcity, climate change, and conflict.

City farming is not only possible, it is the very definition of the kind of meaningful, sustainable innovation we will need to meet the grand challenges of the 21st century: climate change; population growth; ageing population; urbanization; rising demand for energy, food and water; poverty; and access to healthcare.

Urbanization is not about simply increasing the number of urban residents or expanding the area of cities. More importantly, it's about a complete change from rural to urban style in terms of industry structure, employment, living environment and social security.

The specter of climate change threatens worsening natural disasters, rapid urbanization, forced migration, and economic hardship for the most vulnerable. Despite significant global advances, inability to effectively address epidemics and health emergencies still prevail and continuously threaten global health security and economic development.