Vietnam's rice paddies are sometimes called a "cause of global warming," because flooded paddies release large amounts of methane gas. But look at it differently and a big business opportunity lies dormant there.
This article explains the carbon credit mechanism that lets Vietnamese rice farmers earn income while taking climate action, the much-watched AWD technique, and the potential in the carbon market. It is content we want not only people in agriculture but also anyone interested in doing business in Vietnam to read.
Why rice paddies become a methane problem
Rice paddies are kept flooded at all times. Microbes in the soil then break down organic matter and produce methane gas (CH₄). Methane has about 25 times the greenhouse effect of CO₂.
Vietnam is the world's third-largest rice exporter, and about 40% of its land is farmland. The Mekong Delta alone produces about 7 million tonnes of rice a year. Such vast stretches of paddy mean that methane emissions are also enormous.
Agriculture-derived greenhouse gas emissions for Vietnam as a whole are said to account for about 43% of the country's total. agricultural power It is a challenge that stems precisely from this.
Paddy methane and international attention
At COP26 in 2021, countries pledged to cut agriculture-derived methane. Vietnam has also declared carbon neutrality by 2050, and paddy measures have become part of national strategy. This trend is rapidly raising attention to carbon credits.
What is AWD technology?
AWD stands for Alternate Wetting and Drying. Rather than keeping the paddy permanently flooded, it is a cultivation method that deliberately sets periods in which the field is allowed to dry out.
The method is simple: you insert a pipe into the paddy and measure the water level. When the water level drops to about 15 cm below the surface, you irrigate again. You just repeat this cycle.
| Conventional farming | AWD method |
|---|---|
| Permanent flooding | Alternates wet and dry |
| Produces large amounts of methane | Cuts methane emissions by 30–50% |
| High water use | Saves 20–30% of water use |
| No effect on yield | Yield roughly the same |
| No additional cost | Requires measuring equipment |
AWD's biggest advantage is that it can cut methane emissions by up to 50%. There is almost no negative impact on yield, and many farmers even see lower water costs. A low barrier to adoption is one of its features.
The spread of AWD in Vietnam
AWD is being promoted under the leadership of the Asian Development Bank (ADB) and GATE (the agricultural environment technology group). In the Mekong Delta, demonstration projects have surged since the start of the 2020s. In some provinces, adoption on a scale of tens of thousands of hectares has begun with government subsidies.
A recap of how carbon credits work
A carbon credit quantifies the amount of greenhouse gas reduced, expressed as one tonne of CO₂ equivalent. By buying and selling these credits on the market, reduction activities turn into income.
There are two main types of market.
| Type of market | Overview |
|---|---|
| Regulated market (compliance market) | An emissions trading scheme mandated by a country or region |
| Voluntary carbon market (VCM) | A credit market in which companies buy voluntarily |
What Vietnam's agricultural projects are aiming at is mainly the voluntary carbon market. Demand from large Japanese and European companies buying for carbon offsetting is expanding rapidly. Some estimates put the market size at more than US$50 billion by 2030.
The monetization model of Vietnamese paddy projects
Let's look at the concrete flow of how this is actually monetized.
Step 1: Certifying the methodology
To sell carbon credits, you must meet international certification standards. For paddy methane reduction, CDM (Clean Development Mechanism) methodologies such as "AMS-III.AU" are used. You need to pass review by a certification body such as Verra (VCS) or the Gold Standard.
Step 2: Monitoring and measurement
You measure and record methane emissions before and after introducing AWD. Remote monitoring that combines satellite data and sensors is spreading. Highly transparent measurement also builds trust with buyers.
Step 3: Issuing and selling credits
After certification, credits are issued according to the amount reduced. The trading price of one credit (1 t-CO₂) depends on the market, but agricultural ones are generally around US$5–15. For large farms or farming cooperatives, income on the scale of tens of millions of yen a year is realistic.
The model for returning value to farmers
It is costly and labor-intensive for an individual farmer to get certified alone. In practice, farming cooperatives, NGOs and Agritech companies act as intermediaries, returning part of the revenue to farmers, and this is the mainstream model. It spreads the cost and creates a structure in which even small-scale farmers can take part.
Business opportunities for Japanese companies
Japan is one of Vietnam's largest investors. In agriculture too there has been many years of technical cooperation. In this carbon credit field as well, Japanese companies can play a large role.
Technology provision and joint projects
Sensor technology, IoT farming and data management, which Japan is good at, link directly to building AWD monitoring systems. Through cooperation with JICA and the J-Credit scheme, projects using the Joint Crediting Mechanism (JCM) are also advancing.
The JCM can already be used in Vietnam, so Japanese companies can invest in CO₂ reduction projects in Vietnam and apply those credits toward Japan's emissions allowance. It is a case of killing two birds with one stone: infrastructure exports and CO₂ measures.
What it means for food importers
Decarbonizing the supply chain is now an unavoidable theme for importers as well. If a Vietnamese farming partner holds carbon credits, you can appeal to buyers with the brand of low-carbon rice. Considering the impact of the EU's CBAM (Carbon Border Adjustment Mechanism) too, acting early leads to a competitive advantage.
Challenges and outlook
Carbon credits do not have only a bright side. There are also several real-world challenges.
Concerns about credit quality
In the voluntary carbon market, there are also reported cases of low-reliability credits circulating. To avoid greenwashing criticism, buyers too need to check certification standards. Choosing ones with Verra or Gold Standard certification is the basic rule.
Barriers to farmer participation
For Vietnam's smallholder farmers, monitoring and paperwork are a burden. There are also language barriers and literacy issues. How well NGOs and agritech companies can involve farmers will be the key to adoption.
Trends in regulatory development
Based on the revised Law on Environmental Protection of 2022, the Vietnamese government is building a domestic carbon market. A pilot operation is planned from 2025 onward, and once a framework for domestic trading is in place, the incentive for farmers to participate will rise sharply.
Summary
Vietnam's rice paddies are shifting from a source of greenhouse gas emissions to a source of carbon revenue. Methane reduction projects using AWD technology are a mechanism that can achieve both higher farmer income and environmental action at the same time.
To sum up the key points, they are as follows.
| Point | Details |
|---|---|
| The effect of AWD | Cuts methane emissions by up to 50% |
| Profitability | US$5–15 per credit; large farms can earn tens of millions of yen a year |
| Points of contact with Japan | Use of the JCM, sensor technology, and low-carbon rice branding |
| Future trends | Watch the development of Vietnam's domestic carbon market from 2025 onward |
The carbon credit market is still developing. But its direction is clear, and the advantage of entering early is large. We recommend that both people in agriculture and businesspeople start moving now.
At VN AGRI, we share the latest information on Vietnamese agriculture.
