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Ocean Alkalinity Enhancement in En-ROADS Climate Solutions Simulator

The biggest threat to ocean health comes from the buildup of greenhouse gases in the atmosphere, which drives excess ocean heat and acidity. Restoring the ocean requires both reducing greenhouse gas emissions and removing carbon dioxide pollution—potentially through marine carbon dioxide removal (mCDR) pathways.

As knowledge of mCDR grows, there is an increasing need to help decision-makers understand how its various approaches fit together within overall climate strategies. To help close this gap, Ocean Visions partnered with Climate Interactive to integrate Ocean Alkalinity Enhancement (OAE) into En-ROADS, a climate solutions simulator co-developed by Climate Interactive and MIT Sloan.

One of the most actively researched mCDR pathways, OAE could become an important carbon removal approach, but key questions exist about how it fits in climate mitigation portfolios in combination with and relative to other approaches.

The OAE feature in En-ROADS allows users to explore how it could contribute to the global carbon removal needed to meet climate change goals, while examining constraints, costs, and uncertainties. Unlike highly specialized technical models, the En-ROADS simulator was designed to engage diverse users across sectors—without requiring modeling expertise—and deliver compelling data visualizations and analyses instantly. The feature was developed by Climate Interactive with input from Ocean Visions and its deep network of experts.

Explore the En-ROADS Simulator

The feature represents both mineral-based and electrochemical OAE approaches and allows users to:

  • Explore potential climate outcomes associated with scaling OAE
  • Examine and consider deployment constraints, costs, and uncertainties
  • Compare OAE with other potential approaches to CDR
  • Test policy, investment, and technology assumptions
  • Visualize results instantly through interactive scenarios

As governments, investors, and other stakeholders evaluate potential climate actions and pathways forward, accessible decision-support tools are increasingly important. The OAE feature in En-ROADS contributes to those discussions and helps users explore OAE within the broader set of climate solutions.

Why En-ROADS?

The En-ROADS Simulator is one of the world’s most widely used climate decision-support tools.

It has been used by 1.5 million people worldwide, supported by a network of more than 960 Climate Ambassadors in 91 countries. Between 2022 and 2025, simulators from Climate Interactive and MIT Sloan informed 58 government, investment, corporate strategy, philanthropic, and higher-education policies and initiatives.

By bringing OAE into En-ROADS, Ocean Visions is helping ensure that discussions about marine carbon removal can take place within a trusted platform used by policymakers, educators, investors, and other climate stakeholders around the world.