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Climate change is putting pressures on the resources we need to survive: water; agricultural land; food.
How we grow food has enormous effects on the environment - climate change as well as pollution of air, water, and soil.
The ability of communities to meet their most basic needs - food, water, energy, sanitation - is threatened by climate change.
We can choose food that doesn't lead to illnesses like diabetes and cancer. We can choose food that doesn't contribute to water pollution and climate change. And we can choose food that keeps local economies vibrant and farmers on their land.
If we do not change our negative habits toward climate change, we can count on worldwide disruptions in food production, resulting in mass migration, refugee crises and increased conflict over scarce natural resources like water and farm land. This is a recipe for major security problems.
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.
Some global hazards are insidious. They stem from pressure on energy supplies, food, water and other natural resources. And they will be aggravated as the population rises to a projected nine billion by mid-century, and by the effects of climate change. An 'ecological shock' could irreversibly degrade our environment.
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.