What comes next?
Water scarcity, defined as a composite measure of baseline water stress, seasonal variability, interannual variability, ground water table decline, and drought risk, is forecast to increase in the coming years as climate change intensifies, with higher temperatures and longer periods of drought interspersed with periods of very heavy rainfall that cause flooding and other issues.
In the Andes, higher temperatures will mean glaciers shrink further, reducing supplies from meltwater, while in Central America dry areas are forecast to get drier, while wet areas become wetter.
This will affect crop yields, impacting the economy in those countries with large agricultural export sectors, and encouraging migration in areas where subsistence farmers rely on rain-fed agriculture to produce staple crops.
One example is the Dry Corridor in Central America, where the Economic Commission for Latin America and the Caribbean (Eclac) estimates production losses of up to 22% of agricultural GDP by 2100.
Migration will increase as crop yields decrease, driving people to move to urban areas as well as heading north to the US. More urbanisation will concentrate demand for water in cities, and many new arrivals will end up living in informal settlements without access to running water or sanitation services, exacerbating health risks due to diseases such as dengue fever.
Decreasing water availability will also make hydroelectric dams increasingly unviable, with significant implications for energy security. This is particularly true in Ecuador, Panama, and Paraguay, where hydropower provides more than 70% of electricity needs, as well as Brazil, Venezuela, Uruguay, and Peru, where that proportion is more than 50%, according to the International Energy Agency (IEA). In Ecuador, for example, studies project that hydropower generation will fall between 39% and 55% from 2000-2071.
Although it will be tempting to recommission existing thermoelectric power plants in order to secure supplies, doing so while meeting climate commitments will mean that governments need to build out new generating capacity from renewable sources such as solar and wind.
However the output from these variable renewable sources fluctuates depending on wind speeds or the amount of sunlight, meaning that electrical grids must be flexible and robust enough to deal with these peaks and troughs. This will require significant investment in electricity grids, which are complicated and expensive to upgrade, although improvements in battery technology could also help.
These issues will result in further debates over the role of state-owned energy companies, which have flared up throughout the region. In Brazil, for example, disagreement over how much profit should be used to pay dividends or be reinvested in ambitious diversification plans led to the ousting of the CEO of the state oil company Petrobras in May, triggering a sell-off of the company’s shares that shaved over US$11bn off its market value.
On the demand side, population growth and the expansion of water-hungry industries such as mining and agriculture will increase pressure on resources as water demand is forecast to increase by 43% by 2050, the second-largest increase of any world region.
Demand for the region’s critical minerals will continue to grow as the energy transition progresses, encouraging the development of more mines. Many reserves are found in dry areas such as northern Chile and northern Argentina, increasing the impact of operations on the local environment.
High global gold prices will also encourage mining, both legal and illegal. Nicaragua is one country to watch in this regard, with President Daniel Ortega granting myriad mining concessions to Chinese companies after formalising diplomatic relations with Beijing in 2021. Another is El Salvador, where President Nayib Bukele has said that he will lift a ban on metals mining introduced in 2017 in order to exploit the country’s gold deposits.
Government plans to build out industries such as green hydrogen will exacerbate water issues, as will the increasing adoption of AI, which will drive demand for more data centres, and greater industrial use of water will increase contamination and impact water quality, increasing the cost of water treatment services.
These issues will increasingly place households in competition with industrial water users, and increase awareness of the environmental impacts of certain economic sectors. Water will become a key political issue in an increasing number of countries, with the potential to spark social unrest.
Some attempts will likely be made to impose stricter regulations on water use through updated governance, but sweeping reform processes will face stiff opposition from sectors that benefit from the status quo.