Imagine a world with as many as 1 billion people facing harsh climate-change impacts resulting in devastating droughts and/or floods, extreme weather, destruction of natural resources, in particular lands, soils and water, and the consequence of severe livelihoods conditions, famine and starvation.
Although not yet based on definite scientific projections, the proven speed with which the process of climate change has been taking place, might lead to such a scenario by 2050. If so, one in nine human beings would be on the move by then.
Currently, forecasts vary from 25 million to 1 billion environmental migrants by 2050, moving either within their countries or across borders, on a permanent or temporary basis, with 200 million being the most widely cited estimate, according to a 2015 study carried out by the Institute for Environment and Human Security of the United Nations University.
"This figure equals the current estimate of international migrants worldwide."
Other specialized sources estimate that "every second, one person is displaced by disaster." On this, the Oslo-based Norwegian Refugee Council (NRC) reports that in 2015 only, more than 19.2 million people fled disasters in 113 countries. "Disasters displace three to ten times more people than conflict and war worldwide."
One person displaced every second
As climate change continues, NRC adds, it will likely lead to more frequent and severe natural hazards; the impact will be heavy, warns this independent humanitarian organization providing aid and assistance to people forced to flee.
"On average, 26 million people are displaced by disasters, such as floods and storms every year. That's one person forced to flee every second."
For its part, the UN International Organization for Migration (IOM) also forecasts 200 million environmental migrants by 2050, moving either within their countries or across borders, on a permanent or temporary basis. Many of them would be coastal population.
In an interview with Inter Press Service (IPS), the IOM Director General William Lacy Swing explained that political crises and natural disasters are the other major drivers of migration today.
"We have never had so many complex and protracted humanitarian emergencies now happening simultaneously from West Africa all the way to Asia, with very few spots in between which do not have some issue."
The UN specialized body's chief added, "We have today 40 million forcibly displaced people and 20 million refugees, the greatest number of uprooted people since the Second World War."
Another warning comes from the United Nations Convention to Combat Desertification (UNCCD), which estimates that some 135 million people may be displaced by 2045 as a result of desertification.
Up to 12 million hectares of productive land become barren every year due to desertification and drought alone, which is a lost opportunity to produce 20 million tons of grain, adds the Bonn-based Convention secretariat.
Meantime, the increase in droughts and flash floods that are stronger, more frequent and widespread is destroying the land-the Earth's main fresh-water store, according to UNCCD.
"Droughts kill more people than any other single weather-related catastrophe and conflicts among communities over water scarcity are gathering pace. Over 1 billion people today have no access to water, and demand will increase by 30 percent by 2030."
On the other hand, getting sustainable energy to all represents one of the biggest development challenges of the 21st century, it continues.
"Research suggests that 1.4 billion people-over 20 percent of the global population-lack access to electricity, and that at least 2.7 billion people-some 40 percent of the global population-rely on the traditional use of biomass for cooking."
In short, land, water and energy as resources are all pillars of our survival and of sustainable development.
"They stand or fall together. To be sustainable and in particular to reach poor rural populations, we need to enhance supply, access and security across all three pillars, at the same time, while supporting global climate ambitions."
National security, migration
On this, based on the UN Environment Programme's 2009 study "From Conflict to Peace-building. The Role of Natural Resources and the Environment," UNCCD reminds that 40 percent of all intrastate conflicts in the past 60 years are linked to the control and allocation of natural resources.
"The exposure of more and more poor people to water scarcity and hunger opens the door to the failure of fragile states and regional conflicts. Nonstate actor groups are increasingly taking advantage of large cross-border migration flows and abandoned lands."
Where natural assets, including land, are poorly managed, warns the Convention, violence might become the dominant means of resource control, forcing natural resource assets out of the hands of legitimate government.
Meanwhile, the number of international migrants worldwide has been on the rise. According to the International Migration Report (2015), their number has continued to grow rapidly over the past 15 years reaching 244 million in 2015, up from 222 million in 2010 and 173 million in 2000.
Losing productive land is driving people to make risky life choices, UNCCD says, adding that in rural areas where people depend on scarce productive land resources, land degradation is a driver of forced migration.
Africa is particularly susceptible, since more than 90 percent of economy depends on a climate-sensitive natural resource base like rain-fed, subsistence agriculture.
"Unless we change the way we manage our land, in the next 30 years we may leave a billion or more vulnerable poor people with little choice but to fight or flee."