Tag: IPCC

Unveiling the Nexus between Agrifood Systems and Climate Change: Harvesting insights from latest IPCC report

Written by Julian Bañuelos-Uribe on August 2, 2023. Posted in News.

August 2 is Earth Overshoot Day 2023, which marks the date when humanity’s demand for ecological resources and services in a given year exceeds what Earth can regenerate in that year.

Wheat harvest in Juchitepec, State of Mexico. (Photo: Peter Lowe/CIMMYT)

“Climate change is already affecting agrifood systems,” said the director general of the International Maize and Wheat Improvement Center (CIMMYT), Bram Govaerts. “Efforts to protect food and crop systems from things like rising temperatures and drought are part of the overall solution to reverse ecological overshoot; however, we must work hard to ensure these efforts are collaborative, inclusive and sustainable. We want to reach climate goals without compromising food security.”

To harmonize climate change mitigation efforts, CIMMYT and the CGIAR Climate Impact Platform jointly hosted a webinar on July 11, 2023, for relevant stakeholders to discuss the latest findings from the Intergovernmental Panel on Climate Change (IPCC).

The IPCC is an organization of governments that are members of the United Nations and provides regular assessments of the risks of climate change and options for mitigation.

“Climate change in agrifood systems presents special challenges. There are adaptation challenges, but even more importantly, reducing emissions while also protecting the lives and livelihoods of smallholder farmers is a huge challenge that requires scientists and practitioners working together,” said Aditi Mukherji, director of the CGIAR Climate Impact Platform. “Action based on science is needed and IPCC and CGIAR came together in this webinar to present those challenges and solutions.”

The webinar summarized key findings from the IPCC on how climate change effects agrifood systems, including potential adaptation measures and strategies for mitigating the effects of climate change on agri-food systems, how food system management can be part of the solutions to mitigate climate change without compromising food security. Participants also identified potential collaborations and partnerships to implement IPCC recommendations.

“On this acknowledgement of Earth Overshoot Day, the IPCC report is an important milestone as we enact sustainable solutions to protect against climate change and work toward pulling back overshoot,” said Claudia Sadoff, the executive managing director of CGIAR. “All strategies must be under-pinned with reliable data to let us know what is happening now and also in the future.”

The webinar kicked off with presentations from Alex Ruane, co-Director of the GISS Climate Impacts Group, NASA Goddard Institute for Space Studies and IPCC author, Mukherji, and Jim Skea, IPCC Co-Chair.

Challenges Ahead

Ruane examined the current impacts of climate change on agrifood systems and presented findings regarding future effects; knowledge that can help guide priority-setting among relevant stakeholders.

Alex Ruane presented on the current and future impacts of climate change on agrifood systems. (Photo: CIMMYT)

He detailed the perilous state of agrifood systems, as they need to sustainably increase production to provide healthy food for growing populations, adapt to climate change and ongoing climate extremes, mitigate emissions from agricultural lands and maintain financial incentives for agriculture.

Answering those challenges requires the development of models that can track all potential climate drivers. A co-development process with robust data-sharing is vital to provide context for risk management and planning for climate adaptation and mitigation.

Adaptation

Mukherji examined current adaptation efforts within agrifood systems. The IPCC data showed that the people and regions seeing the most adverse effects of climate change have also emitted the fewest amount of greenhouse gases.

There are multiple opportunities for scaling up climate action. CGIAR is working on such responses in the areas of efficient livestock systems, improved cropland management, water use, agroforestry, sustainable aquaculture and more.

Maladaptation can be avoided by flexible, inclusive, long-term planning and implementation of adaptation actions, with benefits shared by many sectors and systems.

Mitigation

Skea investigated the demand and supply side synthesis: land use change and rapid land use intensification have supported increased food production and food demand has increased as well.

He also summarized the IPCC findings regarding land use mitigation efforts, like reforestation (restoring trees in an area where their population has been reduced), afforestation (establishing trees in an area where there has not been recent tree cover) and improved overall forest management, quantifying each action on agrifood systems.

Panel discussion

Moderated by Tek Sapkota, CIMMYT/ CGIAR and IPCC scientist, with panelists Kaveh Zahedi, director of the Office of Climate Change, Biodiversity and Environment, FAO; Jyotsna Puri, associate vice-president, International Fund for Agricultural Development; Jacobo Arango, thematic leader, Alliance of Bioversity and CIAT/CGIAR and IPCC author; Louis Verchot, principal scientist, Alliance of Bioversity and CIAT/CGIAR and IPCC author, and Jim Skea, the panel discussed the IPCC findings and examined crucial areas for targeted development.

Earth Overshoot Day is hosted and calculated by the Global Footprint Network, an international research organization that provides decision-makers with a menu of tools to help the human economy operate within Earth’s ecological limits.

A high throughput crop phenotyping platform, the ‘Leasyscan’ located at ICRISAT’s HQ Patancheru, India. Photo: A. Whitbread (ICRISAT)

Multi-disciplinary approaches to crop improvement for faster climate change adaptation

Written by Alison Doody on July 24, 2020. Posted in News.

This article by Sakshi Saini was originally published on the CCAFS website.

Ever-increasing emissions of greenhouse gases (GHG) is a global concern due to the association of high atmospheric GHG concentrations with global warming and climate change. A large and growing body of evidence predicts that this would further have a multifaceted impact on the human population, especially the poor and vulnerable groups, further exacerbating their vulnerabilities.

But what about crops? Plants use carbon dioxide (CO₂)—one of the most abundant GHGs, for photosynthesis. So shouldn’t an increase in atmospheric carbon dioxide aid crops to flourish? A counter-argument to this would be that at the same time there would be changes in other factors such as a change in precipitation rate, frequency and intensity of rains, among others, which might negatively impact crop production. So, how exactly would climatic variations impact the yield and productivity of crops? These are some of the questions that have been a global concern. Many studies have researched this, employing varied approaches such as systems biology, physiology and crop modelling. However, unprecedented changes in climatic conditions still pose uncertainties on the impacts on crops.

Recent research by an interdisciplinary team of scientists from the International Crops Research Institute for the Semi-Arid Tropics (ICRISAT), the CGIAR Research Program on Climate Chanage, Agriculture and Food Security (CCAFS)-Africa and CCAFS-Asia aspires to answer some of these questions. As part of this research, they have compiled recent progress made in the physiological and molecular attributes in plants, with special emphasis on legumes under elevated CO₂ conditions in a climate change scenario. The study proposes a strategic research framework for crop improvement that integrates genomics, systems biology, physiology and crop modelling approaches to cope with the changing climate. Some of the prime results of the study are as follows:

1. Major physiological and biochemical alterations in legumes triggered by elevated CO2

A range of physiological and biochemical alterations take place in plants exposed to elevated CO₂. In the case of legumes, elevated atmospheric CO₂concentrations also affect the nutritional quality and nodulation, causes changes in rhizosphere and Biological Nitrogen Fixation (BNF), among others. Studies have shown that elevated CO₂ would stimulate plant growth under nitrogen-sufficient conditions, but under nitrogen-limited conditions, it may have the detrimental effect of reducing plant growth by altering its primary metabolism. The anatomical differences between C3 and C4 plants (plants with C3 and C4 photosynthetic pathways) and their different ways of sequestering carbon (removing carbon dioxide from the atmosphere), have been an area of interest for climate scientists. Elevated CO₂combined with limited nitrogen may also promote biological ageing (senescence) rates as observed in flag leaves of rice and wheat. Studies also show that a higher level of carbon dioxide increases senescence rate in legumes.

2. Impact of elevated carbon-dioxide interaction with other abiotic stresses

As mentioned earlier, CO₂ is not the only factor that is impacting plant growth, it is dependent on other environmental factors such as water deficit stress and temperature, among others. Thus, these factors also need to be considered in combination with the atmospheric concentration. Studies have reported that elevated CO₂ induced a decrease (of 10%) in evaporation rates in both C3 and C4 plants. This caused an increase in canopy temperature (0.7 °C) coupled with a 19% yield increase in C3 crops. There is evidence that an increase in CO₂ has also phased down the effect of oxidative stress. Though, there is limited literature available about the impact of elevated carbon dioxide keeping into consideration the drought and heat responses of various crops.

3. Elevated carbon dioxide and its interaction with biotic stress-altered pathogen aggravation and virulence

The changing climate has affected pest-crop dynamics with more frequent outbreaks and changed the geographical distribution of pests, posing an economic threat to crops. Sometimes, other abiotic stresses like drought could increase fungal virulence as reported in drought-tolerant peanut and Aspergillus interaction. However, a combined interaction is not always additive as both unique and common responses have been observed. Increased CO₂causes greater photosynthate availability, but reduced foliage quality along with an increased concentration of plant defensive compounds after a pest infestation. This, in turn, affects insect feeding and increases disease incidence and predator parasitism interactions.

4. Molecular interventions for crop improvement under elevated carbon-dioxide

While elevated CO₂ may cause greater photosynthate availability, the interaction of elevated CO₂ with mentioned biotic and abiotic stresses calls for the development of climate change ready crop varieties. Thus, genomics assisted breeding along with other modern approaches can be very powerful tools to develop superior varieties, to de-risk the existing food system. This transformative approach towards the production of plants and crops would be instrumental in sustainably ensuring food security.

An integrated research framework for the future

The discussion and evidence presented illustrate that the effect of elevated CO₂ under a changing climate scenario is multifaceted and aggravated by the overlapping interaction of stressors. The notion that CO₂ has beneficial effects in terms of increased productivity is now being questioned since the photosynthetic fertilization effect is short term and often not time-tested for major crop species. The IPCC 2018 special report highlights several policy-level approaches that are aimed at limiting greenhouse gas emission. The scientific community needs to be prepared with suitable research outcomes to cope with the effects of elevated atmospheric CO2 levels. In this regard, an integrated framework combining different biological disciplines has been proposed by the team (Fig. 1).

Figure 1: A representation of a multifaceted strategy that could be employed to harness cutting edge technologies and greater precision to cope with elevated CO2, and generally with a changing climate.

While significant advances have been made in crop genomics, systems biology and genomics-assisted breeding, the success of trait dissection and trait deployment is very much dependent on the quality and precision of phenotyping. Recent advances in plant phenotyping using high throughput phenotyping tools have revolutionized the uptake of phenotype and allelic information in a more precise and robust way and complemented high throughput genomic resources

In the opinion of the authors of the publication, an integrated research framework that includes genomics/ systems biology and phenomics together with crop modelling would result in faster data-driven advances for understanding the optimal GxExM (genotype x environment x management) scenarios for current and projected climates. Interdisciplinary approaches as has been done through the Climate-Smart Village approach, are key to graduating from a descriptive level to an improved quantitative and process-level understanding of sustainable crop productivity.

Read more:

Journal article: An integrated research framework combining genomics, systems biology, physiology, modelling and breeding for legume improvement in response to elevated CO2 under climate change scenario

Tek Sapkota (center) stands for a group photo with other scientists working on the IPCC’s special report on climate change and land, at the second lead author meeting in Christchurch, New Zealand, in March 2018.

Breaking Ground: Tek Sapkota finds ways to reduce emissions from agriculture without compromising food security

Written by Rodrigo Ordóñez on December 13, 2018. Posted in Features.

As the world population increases, so does the need for food. “We need to produce more to feed increasing populations and meet dietary demands,” says Tek Sapkota, agricultural systems and climate change scientist at the International Maize and Wheat Improvement Center (CIMMYT). In the case of agriculture, the area of land under cultivation is limited, so increased food production has to come through intensification, Sapkota explains. “Intensification means that you may be emitting more greenhouse gases if you’re applying more inputs, so we need to find a way to sustainable intensification: increase the resilience of production systems, but at the same time decrease greenhouse gas emissions, at least emission intensity.”

Sapkota is involved in a number of global climate change science and policy forums. He represents CIMMYT in India’s GHG platform, a multi-institution platform that regularly prepares greenhouse gas emission estimates at the national and state levels and undertakes relevant policy analyses. Nominated by the CGIAR Research Program on Climate Change, Agriculture and Food Security (CCAFS) and his country, Nepal, he is one of the lead authors of the “special report on climate change and land” of the Intergovernmental Panel on Climate Change (IPCC).

He coordinates climate change mitigation work at CIMMYT. “I am mainly involved in quantification of greenhouse gas emissions and the environmental footprint from agricultural production systems, exploring mitigation options and quantifying their potential at different scales in different regions,” Sapkota says. In addition, he explores low-carbon development activities and the synergies between food production, adaptation and mitigation work within the different components of CIMMYT’s projects.

Agriculture is both a victim of as well as a contributor to climate change, Sapkota explains. “Climate change affects all aspects of food production, because of changes in temperature, changes in water availability, CO₂ concentrations, etc.,” he says. “The other side of the coin is that agriculture in general is responsible for about 25 to 32 percent of total greenhouse gas emissions.”

Measuring emissions and examining mitigation options

A big part of Sapkota’s work is to find ways to mitigate the effects of climate change and the emissions from the agricultural sector. There are three types of mitigation measures, he explains. First, on the supply side, agriculture can “increase efficiency of the inputs used in any production practice.” Second, there’s mitigation from the demand side, “by changing the diet, eating less meat, for example.” Third, by reducing food loss and waste: “About 20 percent of the total food produced for human consumption is being lost, either before harvest or during harvest, transport, processing or during consumption.”

Sapkota and his team analyze different mitigation options, their potential and their associated costs. To that purpose, they have developed methodologies to quantify and estimate greenhouse gas emissions from agricultural products and systems, using field measurement techniques, models and extrapolation.

“You can quantify the emission savings a country can have by following a particular practice” and “help countries to identify the mitigation practices in agriculture that can contribute to their commitments under the Paris climate agreement.”

Their analysis looks at the biophysical mitigation potential of different practices, their national-level mitigation potential, their economic feasibility and scalability, and the country’s governance index and readiness for finance — while considering national food security, economic development and environmental sustainability goals.

Recently, Sapkota and his colleagues completed a study quantifying emissions from the agricultural sector in India and identifying the best mitigation options.

This type of research has a global impact. Since agriculture is a contributor to climate change “better management of agricultural systems can contribute to reducing climate change in the future,” Sapkota says. Being an important sector of the economy, “agriculture should contribute its share.”

CIMMYT scientist Tek Sapkota (second from left) explains greenhouse gas emissions measurement methods to a visiting group of scientists. — *CIMMYT scientist Tek Sapkota (second from left) explains greenhouse gas emissions measurement methods to a visiting group of CCAFS and Indian scientists. (Photo: CCAFS)*

Impact on farmers

Sapkota’s research is also helping farmers today. Inefficient use of products and inputs is not only responsible for higher greenhouse gas emissions, but it also costs farmers more. “For example, if farmers in the Indo-Gangetic Plain of India are applying 250 to 300 kg of nitrogen per hectare to produce wheat or rice, by following precision nutrient management technologies they can get similar yield by applying less nitrogen, let’s say 150 kg.” As farmers cut production costs without compromising yield, “their net revenue from their products will be increased.”

Farmers may also get immediate benefits from government policies based on the best mitigation options. “Governments can bring appropriate policy to incentivize farmers who are following those kinds of low-emission technologies, for example.”

Farmers could also get rewarded through payments for ecosystem services or for their contribution to carbon credits.

Sapkota is happy that his work is beneficial to farmers. He was born in a small village in the district of Kaski, in the mid-hills of Nepal, and agriculture was his family’s main livelihood. “I really enjoy working with farmers,” he says. “The most fascinating part of my work is going to the field: talking to farmers, listening to them, learning what kind of farming solutions they’re looking for, and so on. This helps refine our research questions to make them more strategic, because the way farmers look at a problem is sometimes entirely different from the way we look at it.”

When he was in Himalaya Secondary School, he studied agriculture as a vocational subject. “I was interested because we were doing farming at home.” This vocation got cemented in university, in the 1990s. When he heard about the agricultural industry and the future opportunities, he decided to pursue a career in science and focus on agriculture. He got his bachelor’s and master’s degree of science in agriculture from the Institute of Agriculture and Animal Science (IAAS), Tribhuvan University, in Nepal.

*Tek Sapkota (second from left) and other scientists participate in a small group session during a meeting of lead authors of the Intergovernmental Panel on Climate Change (IPCC).*

A global path

He first heard about CIMMYT when he was doing his master’s. “CIMMYT was doing research in maize- and wheat-based plots and systems in Nepal. A few of my friends were also doing their master theses with the financial support of CIMMYT.” After his master’s, he joined an organization called Local Initiatives for Biodiversity, Research and Development (LI-BIRD) which was collaborating with CIMMYT on a maize research program.

Sapkota got a PhD in Agriculture, Environment and Landscapes from the Sant’Anna School of Advanced Studies in Italy, including research in Aarhus University, Denmark.

After defending his thesis, in 2012, he was working on greenhouse gas measurement in the University of Manitoba, Canada, when he saw an opening at CIMMYT. He joined the organization as a post-doctoral fellow and has been a scientist since 2017. Sapkota considers himself a team player and enjoys working with people from different cultures.

His global experience has enriched his personal perspective and his research work. Through time, he has been able to see the evolution of agriculture and the “dramatic changes” in the way agriculture is practiced in least developed countries like Nepal. “When I was a kid agriculture was more manual … but now, a lot of technologies have been developed and farmers can use them to increase the efficiency of farming”.