Using land to mitigate climate change: hitting the target, recognizing the trade-offs

Area of Science:

• Climate Science
• Environmental Economics
• Agricultural Economics

Background:

• Land use is a critical factor in climate change mitigation strategies.
• Global temperature stabilization targets, such as limiting warming to 2°C above preindustrial levels, require comprehensive policy approaches.
• The interplay between climate policies, land use, and agricultural markets is complex and requires integrated modeling.

Purpose of the Study:

• To explore the role of land-use options in achieving global climate change mitigation targets.
• To assess the impact of different climate policies, including energy-only and energy+land scenarios, on carbon sequestration and global temperatures.
• To analyze the consequences of these policies on agricultural prices and food security, especially in vulnerable regions.

Main Methods:

• Utilized an integrated global system model to simulate various climate policy scenarios.
• Quantified the potential of land as a carbon sink under different policy interventions.
• Evaluated the economic impacts on agricultural product prices and the share of income spent on food.

Main Results:

• An ambitious Energy-Only climate policy, even with biofuels, is unlikely to meet the 2°C target.
• An Energy+Land policy, incorporating ideally priced land carbon fluxes and biofuels, substantially increases land's carbon sink capacity (approx. 178 Pg C).
• Without carbon pricing incentives, land's role shifts from a significant sink to a smaller sink or even a net source, leading to increased warming.

Conclusions:

• Pricing land carbon fluxes is essential for maximizing land's potential as a carbon sink and achieving climate targets.
• While effective for mitigation, land-use policies can lead to substantial increases in agricultural prices, disproportionately affecting the poorest populations.
• Integrated modeling is vital for understanding the trade-offs between climate mitigation goals and food security implications.