For now, farmers have been able to boost agricultural productivity by irrigating more land and applying heavier doses of fertilizer and pesticides. But the report says these practices are not sustainable: They have eroded and degraded soil while polluting and depleting water supplies and shrinking the world’s forests.
The FAO report discusses some important climate change impacts, such as changing distribution of rainfall, the suitability of land for certain crops, the spread of insects and other pests, and shorter growing seasons in regions affected by more intense droughts. While not the sole source of obstacles facing global agriculture, the report makes clear that climate change is further stressing agricultural systems and amplifying global food production challenges.
The report also offers hope that the problems are solvable: Water degradation can be reversed by turning to smart planning and coordination of sustainable farming practices and by deploying new innovative technologies. More sustainable agriculture can also help fight climate change: For instance, the report notes that wiser use of soils can help sequester some of the greenhouse gasses currently emitted by agricultural activities.
Drastic changes in climate will require regions to adjust the crops they grow. For example, the report predicts that much cereal production will probably have to move north, to Canada and northern Eurasia. Brazil and northern Africa may have a harder time growing coffee, but it may get easier in eastern Africa.
A changing climate ‘may bring opportunities for multiple rainfed cropping, particularly in the tropics and subtropics.’ And for areas ‘where the climate becomes marginal for current staple and niche crops, there are alternative annual and perennial tree crops, livestock, and soil and water management options available.’
The report recommends seed and germoplasm exchanges globally and among regions, and investments to develop crops that can withstand changes in temperature, salinity, wind, and evaporation. The changes will not be easy, the report says, but they may be necessary to avoid widespread hunger and other catastrophes.
Over the past 20 years, the global population has risen by more than 25 percent from just over six billion to nearly eight billion people. The amount of land used to grow crops has increased by just four percent over that time, as farmers have been able to meet the growing demand for food by dramatically increasing the productivity per acre of agricultural land. They’ve done so, for example, by increasing use of diesel-fuelled machinery, fertiliser, and pesticides.
But these practices have come at a price. “Human-induced degradation affects 34 percent — 1,660 million hectares — of agricultural land,” the FAO reports. “The treatment of soils with inorganic fertilisers to increase or sustain yields has had significant adverse effects on soil health, and has contributed to freshwater pollution induced by run-off and drainage.”
Excerpted: ‘Farms at the Breaking Point Worldwide’