Research

CLIMA aims to inform policymakers and stakeholders on potential biofuels expansion scenarios in Brazil under climate change until 2030. The research behind this is organized five precise research lines:

  1. Projecting agricultural productivity under climate change
  2. Estimating biofuels expansion and land use change through to 2030
  3. Modelling water flows in water basins with significant biofuels expansion
  4. Macroeconomic assessment on welfare and food security impacts due to biofuels expansion
  5. Research on community perceptions on land use change and biofuels

Through interdisciplinary science in CLIMA we aim to enable sound policymaking in Brazil that mitigates adverse impacts on land use, water resources, and food security, while simultaneously promoting sustainable production of biofuels.

This approach is supported by a stakeholder network and knowledge dissemination strategy in order to integrate expert knowledge into the analysis and facilitate dissemination of project results to policy planning and sustainability initiatives.

1. Projecting agricultural productivity under climate change

Crop productivity is expected to decrease significantly (increase in the case of sugarcane) as a consequence to climate change. But estimating these impacts is difficult for Brazil due to data limitations. This research line clarifies the links between crop productivity (biofuel feedstock, other crops) and changes in precipitation and temperature for all geographical regions in Brazil, and then projects crop productivities into the future (2007-2043) based on existing IPCC climate scenarios (RCP 6.0).

Basic meteorological data are essential for evaluating impacts of spatial and temporal in climate forcing on agriculture and water resources. For this the CLIMA research team at University of Texas at Austin developed high-resolution grids (0.25∘ × 0.25∘) of daily precipitation, evapotranspiration, maximum and minimum temperature, solar radiation, relative humidity, and wind speed. This gridded meteorological data set significantly advances the availability of climate data in Brazil and is available freely for download for interested researchers.

Ongoing work focuses on applying FAO methodology for estimating evapotranspiration and yield reductions due to lack of rainfall as a proxy for measuring climate impact on crop productivities.

2. Estimations of biofuels expansion and land use change through 2030

Biofuels are relevant in direct and indirect land use change. For example, expansion of bioenergy feedstock can push up prices for food affect food, or increase deforestation pressures in the Amazon region. This research line estimates probable spatial biofuel expansion scenarios and of other agricultural/forestry activities until 2030, integrating the impact of climate change through crop yield functions. Alternative policy scenarios (e.g. increased vehicular efficiency in transportation sector or efficient 2nd generation biofuels) will help understand what policies could mitigate adverse social or environmental impacts.

The modeling is based on application of the Brazilian Land Use Model (BLUM) which translates national economic and energy projections into land use dynamics at microregional scale (550 microregions within Brazilian territory). CLIMA output will include future spatial distribution of relevant energy crops (sugarcane, soybean and oil palm) as well as that of other agricultural commodities and livestock, deforestation, and GHG mitigation potential in land use in Brazil.

3. Basin scale modelling of water flows in regions with significant biofuels expansion

Water for agriculture in Brazil is increasingly competing with different end-uses. This affects the irrigation potential for main biofuel crops such as sugarcane ethanol and soybean. Two recent examples: in São Paulo state human consumption has been affected by a few severe droughts years, putting doubts about the potential for sugarcane irrigation in the region. And in Northeast Brazil’s dryland regions agricultural production and hydroelectricity generation has been severely compromised due to the worst drought in over 50 years. These water conflicts may increase as biofuels use increases and climate change impacts unfolds in the future.

This research line estimates direct and indirect variations in water resources availability for 2-3 target basins (45,000 km2 to 60,000 km2) due to policy interventions, agricultural land choices, and climatic impacts (e.g. variations in precipitation and temperature) in order to assess the water sustainability impact of biofuels. Ongoing work includes developing a hydrological watershed model and simulating future scenarios in two basins: Ivinhema in Mato Grosso do Sul, and Corrente in Bahia.

4. Macroeconomic impacts of biofuels expansion in welfare and food security

Biofuels production affects not only the environment, but also important government strategies such as reducing poverty or maintaining food affordable for poor consumer families. In land use modeling, these effects can usually not be assessed given the lack of integration with labor market models. CLIMA is to assess macroeconomic feedbacks of land use policies on the Brazilian economy until 2030.

For these calculations the Brazilian Land Use Model [link to c.2] (BLUM) model is linked to the Brazilian version of IMACLIM-S model, a hybrid CGE model that is able to discern macroeconomic impacts of climate and socioeconomic policies in Brazil. IMACLIM-S integrates sectors such as energy biofuels, transport, household income, and unemployment. Income distribution effects and affordability of food in different policy scenarios are currently analyzed using Gini indices and simplified Lorenz curves for each scenario.

5. Research on community perceptions on land use change and biofuels

Indigenous and local communities in many Brazilian regions are strongly affected by land use change, and those communities have their own interpretations on climate change and biofuels. Given their urgency these perceptions need to be understood and incorporated into research and policy recommendations, including in CLIMA.

For this a detailed review study on community perceptions in project target regions has been undertaken by the project team in order to understand the socioenvironmental consequences of biofuels expansion and climate change on rural livelihoods, land use change, and water resources. This review incorporates semi-structured interviews with key stakeholders and policymakers in Brasília and São Paulo, and is currently being prepared for wider publication.

Together with the School of Natural Resources and Environment of University of Michigan (USA) the CLIMA project is also now also engaged in a scoping study on adolescent’s perceptions on climatic change and the impacts it has on their subsistence, using drought-vulnerable communities in Northeast Brazil as example. This field-based research complements our review study is expected to be published in the second half of 2016.

Photo credit: Vinícius Mendonça – ASCOM/IBAMA (CC BY)

CLIMA Land Water Energy: Research