Rethinking Climate Change: The Overlooked Role of Agriculture

A new study published in the journal Environmental Research Letters highlights the need for a fundamental shift in how carbon emissions are measured. It reveals that agriculture—particularly animal agriculture—has driven more climate change than any other human activity. The study calls for consistent carbon accounting, as current IPCC (Intergovernmental Panel on Climate Change) greenhouse gas accounting rules exclude deforestation-related CO₂ from full emissions measurements, significantly distorting our understanding of climate change drivers.

Gerard Wedderburn-Bisshop, lead scientist at the World Preservation Foundation and study author, explains:

“A decision in the late 1980’s to treat carbon emissions differently, depending on their source, has seriously skewed climate science and policy.”

A More Accurate Approach to Climate Accounting

The study proposes a new framework to fairly allocate sectoral warming responsibility using three key advances:

• Consistent accounting of all carbon sources: Under current rules, deforestation emissions are largely overlooked, while fossil fuel emissions are counted in full. Applying uniform accounting standards to both land-use and fossil carbon reveals the true scale of emissions from land clearing.
• Using Effective Radiative Forcing (ERF) to compare greenhouse gases: Traditional assessments rely on Global Warming Potentials (GWPs), which misrepresent real-world warming effects. ERF provides a more accurate, immediate measure of each gas’s contribution to climate change.
• Including all emissions—both heating and cooling: Climate models often ignore cooling emissions (e.g., aerosols from fossil fuel combustion) that have masked 75% of fossil fuel-induced warming. As these aerosols fade, previously hidden warming will accelerate climate change.

Figure 1: EFR by sector and consistent carbon accounting using datasets from 1750-2020. Credit: Gerard Wedderburn-Bisshop

By integrating these advances, the study delivers a more transparent and inclusive assessment of human-driven climate change. The findings show that land-use changes have emitted more CO₂ than fossil fuels since 1750. As seen in Figure 1, the agriculture sector contributes 60% of emissions.

Figure 2: Effective Radiative Forcing by sector and emissions 1750-2020. Credit: Gerard Wedderburn-Bisshop

Moreover, methane (CH₄ in Figure 2 above)—primarily from animal agriculture—has been severely underestimated, despite driving half of today’s global warming.

Policy Implications: Urgent Reforms Needed

The study’s findings challenge current climate policies and call for immediate action:

• Acknowledging animal agriculture as the top climate change driver: This demands a re-evaluation of agricultural subsidies, which often support environmentally harmful practices.
• Strengthening methane reduction strategies: Since methane warms the planet without offsetting cooling emissions, cutting methane is one of the fastest ways to slow climate change.
• Reforming carbon markets: Applying consistent carbon accounting increases the value of forest preservation efforts by a factor of 2.8, reinforcing the need for initiatives like REDD+.
• Creating a complete Carbon Budget: A more accurate emissions model enhances climate policy, biodiversity conservation, and mitigation strategies.

Nature’s Role in Carbon Sequestration

The study highlights the immense role that forests, the biosphere, and oceans play in mitigating climate change, having absorbed 76% of carbon emissions since 1750.

“Nature has been quietly dealing with our pollution without proper recognition. Expanding that drawdown power is what can save us from this mess, but it will mean bringing back forests and changing land use,” says Wedderburn-Bisshop.

Even today, nature sequesters 65% of annual carbon emissions, despite deforestation in key regions. Strengthening global commitments to forest protection to expand nature’s carbon drawdown capacity is essential for addressing the climate crisis.

A Paradigm Shift for Climate Action

These findings call for a fundamental shift in climate policy. By adopting consistent carbon accounting, policymakers can accurately identify emission sources and implement more effective, equitable climate solutions. Protecting forests, cutting methane, and reforming land use and agricultural practices are critical steps toward a sustainable future.

As individuals, we can reduce our environmental impact and help combat climate change by adopting a vegan lifestyle, supporting the Plant Based Treaty, urging local councils to endorse it, and inspiring others to take action.