Quantcast
Environmental News for a Healthier Planet and Life

Climate Crisis Will Shift Tropical Rain Belt and Create Food Insecurity for Billions, Study Finds

Climate
Climate Crisis Will Shift Tropical Rain Belt and Create Food Insecurity for Billions, Study Finds
Madagascar has been experiencing ongoing droughts and food insecurity since 2016. arturbo / Getty Images

Nearly 1.6 million people in the southern part of Madagascar have faced food insecurity since 2016, experiencing one drought after another, the United Nations World Food Program reported.


A study published Monday found billions more could face food insecurity as Earth's tropical rain belt shifts in response to climate change, causing increased drought stress and intensified flooding.

"Our work shows that climate change will cause the position of Earth's tropical rain belt to move in opposite directions in two longitudinal sectors that cover almost two thirds of the globe, a process that will have cascading effects on water availability and food production around the world," lead author Antonios Mamalakis, a postdoctoral fellow in the Department of Atmospheric Science at Colorado State University, told UCI News.

Researchers at the University of California, Irvine and other institutions analyzed how the tropical rain belt would respond to a future where greenhouse gas emission continued to rise through 2100, UCI News reported. Their findings, published in Nature Climate Change, revealed the rain belt will shift northward over the Eastern Hemisphere, impacting countries in southeastern Africa.

In Madagascar, these impacts are already being felt.

"We only had one day of rain in December in the whole region. And the thunderstorms have been blasting… and destroying and burying the crops that were there," Lola Castro, the United Nations World Food Program regional director for Southern Africa and Indian Ocean States, told UN News. "The result is famine-like conditions."

Madagascar's vulnerability to the climate crisis, exacerbated by the Covid-19 pandemic, has left people with little to eat, Castro said. "Cactus mixed with mud, roots, whatever they can find, leaves, seeds, whatever is available."

The rain belt is projected to shift toward a warming atmosphere, co-author James Randerson, UCI's Ralph J. & Carol M. Cicerone Chair in Earth System Science, explained. "In Asia, projected reductions in aerosol emissions, glacier melting in the Himalayas and loss of snow cover in northern areas brought on by climate change will cause the atmosphere to heat up faster than in other regions," he told UCI News.

Since 2000, glaciers in the Himalayas are losing more than a vertical foot and half of ice every year, Columbia University's Earth Insititute reported, double the amount from 1975 to 2000.

"We know that the rain belt shifts toward this heating, and that its northward movement in the Eastern Hemisphere is consistent with these expected impacts of climate change," Randerson told UCI News.

In the Western Hemisphere, the rain belt is expected to move in the opposite direction by shifting southward, the study found. This will cause greater drought stress to Central America, a region which is experiencing more than five years of recurring drought, Reuters reported.

By combining an engineering approach to both climate science and data analytics, the team of researchers found previously unknown consequences associated with global warming. They also saw how much more there is to learn.

"The complexity of the Earth system is daunting, with dependencies and feedback loops across many processes and scales," author Efi Foufoula-Georgiou, UCI Distinguished Professor of Civil and Environmental Engineering, told UCI News.

Determining how these changes will impact flooding, droughts, infrastructure and ecosystems can inform adaptation strategies and policies, Foufoula-Georgiou told UCI News. But time may be running out.

"What we are saying here is that the situation we're facing in southern Madagascar is not normal," Lola Castro told UN News, regarding the humanitarian crisis. "It's very different to any normal year of crisis and that we really need to act immediately."

Ningaloo Reef near Exmouth on April 2, 2012 in Western Australia. James D. Morgan / Getty Images News

By Dana M Bergstrom, Euan Ritchie, Lesley Hughes and Michael Depledge

In 1992, 1,700 scientists warned that human beings and the natural world were "on a collision course." Seventeen years later, scientists described planetary boundaries within which humans and other life could have a "safe space to operate." These are environmental thresholds, such as the amount of carbon dioxide in the atmosphere and changes in land use.

Read More Show Less

EcoWatch Daily Newsletter

A 3-hour special film by EarthxTV calls for protection of the Amazon and its indigenous populations. EarthxTV.org

To save the planet, we must save the Amazon rainforest. To save the rainforest, we must save its indigenous peoples. And to do that, we must demarcate their land.

Read More Show Less

Trending

UN Secretary General Antonio Guterres delivers a video speech at the high-level meeting of the 46th session of the United Nations Human Rights Council UNHRC in Geneva, Switzerland on Feb. 22, 2021. Xinhua / Zhang Cheng via Getty Images

By Anke Rasper

"Today's interim report from the UNFCCC is a red alert for our planet," said UN Secretary General Antonio Guterres.

The report, released Friday, looks at the national climate efforts of 75 states that have already submitted their updated "nationally determined contributions," or NDCs. The countries included in the report are responsible for about 30% of the world's global greenhouse gas emissions.

Read More Show Less
New Delhi's smog is particularly thick, increasing the risk of vehicle accidents. SAJJAD HUSSAIN / AFP via Getty Images

India's New Delhi has been called the "world air pollution capital" for its high concentrations of particulate matter that make it harder for its residents to breathe and see. But one thing has puzzled scientists, according to The Guardian. Why does New Delhi see more blinding smogs than other polluted Asian cities, such as Beijing?

Read More Show Less
A bridge over the Delaware river connects New Hope, Pennsylvania with Lambertville, New Jersey. Richard T. Nowitz / Getty Images

In a historic move, the Delaware River Basin Commission (DRBC) voted Thursday to ban hydraulic fracking in the region. The ban was supported by all four basin states — New Jersey, Delaware, Pennsylvania and New York — putting a permanent end to hydraulic fracking for natural gas along the 13,539-square-mile basin, The Philadelphia Inquirer reported.

Read More Show Less