Urbanization dirty land drivers#

These efforts involve working with farmers to safeguard arable land, repairing degraded land, and managing water supplies more effectively. In 1994, the United Nations established the Convention to Combat Desertification (UNCCD), through which 122 countries have committed to Land Degradation Neutrality targets, similar to the way countries in the climate Paris Agreement have agreed to targets for reducing carbon pollution. This often produces several human health problems that range from malnutrition, respiratory disease caused by dusty air, and other diseases stemming from a lack of clean water. Food often doesn't grow, water can't be collected, and habitats shift. When land becomes desert, its ability to support surrounding populations of people and animals declines sharply. Another recent study found that the same level of warming would result in 'aridification,' or drying out, of up to 30 percent of Earth's land surface. The Mediterranean region would experience a drastic transformation with warming of 2 degrees Celsius, according to one study, with all of southern Spain becoming desert. The prospect of climate change and warmer average temperatures could amplify these effects. And in Africa's Sahel region, bordered by the Sahara Desert to the north and savannas to the south, population growth has caused an increase in wood harvesting, illegal farming, and land-clearing for housing, among other changes. In the regions of Uzbekistan and Kazakhstan surrounding the Aral Sea, excessive use of water for agricultural irrigation has been a primary culprit in causing the sea to shrink, leaving behind a saline desert.

Urbanization dirty land drivers#

The drivers of land degradation vary with different locations, and causes often overlap with each other. Would You Stay if Your Home Became a Desert? The commission's Joint Research Centre found that a total area half of the size of the European Union (1.61 million square miles, or 4.18 million square kilometers) is degraded annually, with Africa and Asia being the most affected. More than 75 percent of Earth's land area is already degraded, according to the European Commission's World Atlas of Desertification, and more than 90 percent could become degraded by 2050. The risk of desertification is widespread and spans more than 100 countries, hitting some of the poorest and most vulnerable populations the hardest, since subsistence farming is common across many of the affected regions. Where is desertification happening, and why?

About 2 billion people live on the drylands that are vulnerable to desertification, which could displace an estimated 50 million people by 2030. Climate change also plays a significant role, increasing the risk of drought.Īll of this contributes to soil erosion and an inability for the land to retain water or regrow plants. In the course of these activities, trees and other vegetation are cleared away, animal hooves pound the dirt, and crops deplete nutrients in the soil.

This degradation tends to be driven by a number of factors, including urbanization, mining, farming, and ranching. While land degradation has occurred throughout history, the pace has accelerated, reaching 30 to 35 times the historical rate, according to the United Nations. These drylands account for more than 40 percent of the world's terrestrial surface area. While interpretations of the term desertification vary, the concern centers on human-caused land degradation in areas with low or variable rainfall known as drylands: arid, semi-arid, and sub-humid lands. As global temperatures rise and the human population expands, more of the planet is vulnerable to desertification, the permanent degradation of land that was once arable.