As the world’s population grows, the demands for agriculture keep increasing. Agriculture is the primary source of the world’s food supply, and every country depends on it not only for food but also for feed, fiber and fuel.
However, modern agriculture, including food and feed production and distribution, contribute enormously to greenhouse gas emissions that cause global warming, which leads to climate change.
Urgent challenge to global food production
Climate change is an urgent global challenge. A study in 2019, led by the University of Minnesota with researchers from the University of Oxford and the University of Copenhagen, reports that climate change is already affecting global food production.
The study found that climate change has caused significant yield decreases in the world’s top 10 crops, while half of all food-insecure countries are experiencing a reduction in crop production.
The accelerating pace of climate change, coupled with the growing global population and diminishing natural resources, threatens global food security.
Biotech crops slow down the effects of climate change
Biotechnology offers a solution to reduce greenhouse gases and slow down climate change.
These crops, for the last 25 years of commercialization, have contributed to reducing carbon dioxide (CO2) emissions and allowed farmers to use environment-friendly energy, less fertilizer and chemical pesticides, and practice soil carbon sequestration.
Here are five solutions that biotechnology offers to slow down climate change.
1 . Herbicide tolerant biotech crops
Herbicide tolerant (HT) biotech crops are vital to farmers’ fight against weeds. HT crops tolerate exposure to broad-spectrum herbicides, such as glyphosate and glufosinate.
These crops are compatible with no-till methods, which help preserve the topsoil.
HT biotech crops facilitate zero or no-till farming, which significantly reduces the loss of carbon from the soil (carbon sequestration), CO2 emissions and fuel use, and prevents soil erosion.
A study conducted at the University of Saskatchewan, Canada, in 2021 reports that HT biotech crops increase soil carbon sequestration, keeping CO2 in the ground instead of releasing it into the atmosphere.
HT biotech crops help farmers and the environment as they require less labor and fewer resources for fossil fuel for tractors that plow the soil.
Since their introduction, herbicide tolerance technology has helped millions of farmers who plant HT biotech crops.
In 2019, the International Service for the Acquisition of Agri-biotech Applications (ISAAA) reported that herbicide-tolerance trait was the second most dominant trait deployed in soybeans, maize, canola, cotton, sugar beets, and alfalfa, occupying 81.5 million hectares.
2. Insect resistant biotech crops
Insect pests cause significant damage to crops, reducing yields and prompting farmers to continually spray their plants with pesticides.
Excessive use of the pesticides is harmful to humans and the environment so scientists developed insect-resistant (IR) biotech crops using a gene from the soil bacterium Bacillus thuringiensis.
Insect resistant biotech crops, first introduced in corn and cotton in the mid-1990s, require fewer pesticide sprays, which results in savings of tractor/fossil fuel and, thus, less CO2 is released into the atmosphere.
According to the 2018 PG Economics study by Graham Brookes and Peter Barfoot, planting IR biotech crops has helped save 776 million kg. a.i. of pesticides in 1996-2018, and by 51.7 million kg in 2018 alone from being released into the environment.
In 2019, ISAAA reported that IR biotech crops were planted in 23.6 million hectares in India, Brazil, China, Pakistan, USA, Myanmar, South Africa, Sudan, Malawi, Nigeria, Spain, Portugal, Bangladesh, Eswatini, and Ethiopia.
Brookes and Barfoot report that globally in 2018, the farm-level impact of using IR biotech cotton was $4.38 billion and $3.37 billion for IR biotech maize.
3. Salinity tolerant crops
Biotech salt-tolerant crops have been developed in countries, such as the USA, China and Australia, and some are currently undergoing field trials.
In Australia, field trials of 1,161 lines of genetically modified (GM) wheat and 1,179 lines of GM barley modified to contain one of 35 genes obtained from wheat, barley, corn, thale cress, moss, or yeasts were conducted from 2010 to 2015.
Some of the genes are expected to enhance tolerance to drought, cold, salinity and low phosphorous.
Sugarcane that contains a transcription factor (OsDrebia) also completed field trial in 2015.
Genes influencing salt tolerance have been found in various plants. In 2019, scientists at the University of Western Australia discovered two enzymes that explain wheat’s sensitivity to salty soils.
In 2020, scientists from China National Rice Research Institute identified a gene in rice that influences sugar metabolism as well as the plant’s response to salinity stress.
Similarly, a team from the US and South Korea has engineered thale cress to behave like a succulent with improved water-use efficiency and salinity tolerance by overexpressing a gene involved in berry development in wine grapes.
4. Drought resistant crops
Agriculture is the largest consumer of water in the world, and in many developing countries, the use of water for agriculture can exceed 90 percent of consumption.
The scarcity of water presents a major disaster worldwide, and droughts have caused significant yield losses in recent years.
Drought-tolerant biotech crops carrying genes for water-stress management have been developed by scientists as a solution to yield losses due to drought.
Drought tolerant sugarcane was planted in 2,000 hectares in Indonesia in 2019. Sugarcane is sensitive to drought and biotech sugarcane was developed to address local demand in the face of climate change.
Soybean varieties carrying the drought-tolerant HB4 trait were introduced in Argentina in 2019.
HB4 soybeans deliver two layers of value for farmers as they are both drought- and herbicide-tolerant. Its technology reduces yield loss when the crop is challenged by drought.
The US approval for HB4 soybeans followed in the same year, with the approval in Canada granted in 2021.
In 2020, Argentina became the first country in the world to approve HB4 drought tolerant wheat for growth and consumption.
The HB4 trait increases wheat yields by up to 20 percent and is currently the only drought-tolerance technology for wheat and soybean crops in the world.
In November 2021, Brazil approved HB4 wheat flour for animal and human consumption.
5. Cold tolerant crops
Using genetic and molecular approaches, several genes for cold tolerance have been identified in rice, sugarcane, sorghum and potatoes.
Cold tolerant GM crops are being developed, such as GM eucalypti, which is currently being field-tested in the US by Arborgen LLC since 2010.
Thale cress has been improved to contain the DaIRIP4 from Deschapsia antarctica, a hairgrass that thrives in frosts down to negative 30 degress Celsius, and sugarcane is being introgressed with genes from cold tolerant wild varieties.
Biotech in PHL; other benefits
Biotech crops are planted and adopted globally because of their enormous benefits to the environment, animal and human health, and to the improvement of global food security, sustainability and climate change mitigation.
In the Philippines, 875,000 hectares of biotech stacked insect resistant/herbicide tolerant corn was planted by more than 673,000 farmers as of 2019. Biotech corn has been grown in the country since 2003.
In July 2021, commercial planting of genetically engineered Golden Rice was approved by the Department of Agriculture Bureau of Plant Industry, while Bt eggplant was approved for direct use as food, feed or for processing.
Biotech crops in the pipeline in the country include biotech delayed ripening and ringspot resistant papaya and Bt cotton.
Biotech increased crop productivity worldwide by 822 million tons valued at $224.9 billion from 1996 to 2018; and 86.9 million tons valued at $18.9 billion in 2018 alone.
These crops also help conserve biodiversity and provide a better environment by saving on pesticide use and reducing CO2 emissions in 2018 by 23 billion kg that is equivalent to taking 15.3 million cars off the road for one year.
Lastly, biotech crops help alleviate poverty by uplifting the economic situation of 17 million small farmers and their families totaling more than 65 million people, who are some of the poorest people in the world.
Clement Dionglay is with International Service for the Acquisition of Agri-biotech Applications Southeast Asia Center’s Global Knowledge on Crop Biotechnology.
Image credits: ISAAA photo