Key Takeaways
- • CalSTRS, the $400 billion California State Teachers' Retirement System, has reduced Global Equity portfolio emissions by 21.5% using 2024 data, with the low-carbon equity strategy approved in 2022 generating more than 16% emissions reductions overall.
- • The pension fund allocated 20% of its total public equity portfolio to a low-carbon index in September 2022, with approximately $31.2 billion managed internally against benchmark as of March 31, 2026, expanding the MSCI Low Carbon Target Index allocation from 10% to 21% of the portfolio.
- • CalSTRS embeds emissions reductions into portfolio construction through risk budgeting frameworks across Global Equity and Fixed Income teams, balancing climate objectives with disciplined risk management rather than treating decarbonization as a standalone initiative.
- • The Fixed Income team's 15% low-carbon credit-related index optimization strategy, adopted in May 2023, achieved a 9.3% decline in corporate credit portfolio emissions, exceeding the benchmark's 8.8% decline while maintaining tight tracking error.
- • CalSTRS committed to achieving net-zero portfolio emissions by 2050 as part of its broader strategy to mitigate climate-related risks to long-term portfolio resilience and maximize returns for beneficiaries.
Summary
The California State Teachers' Retirement System is operationalizing its net-zero emissions pledge through a sophisticated risk budgeting approach that integrates climate objectives directly into portfolio construction and asset allocation decisions. Rather than treating decarbonization as an isolated sustainability mandate, CalSTRS embeds emissions reductions into the core risk-management frameworks governing its $400 billion investment portfolio, allowing investment teams to evaluate carbon reductions relative to active risk and portfolio performance metrics.
Since pledging to achieve net-zero greenhouse gas emissions by 2050, CalSTRS has achieved measurable progress through targeted index strategies across equity and fixed income allocations. The Global Equity team approved a low-carbon equity strategy in September 2022, allocating 20% of total public equity to a low-carbon index. As of March 31, 2026, the fund managed approximately $31.2 billion internally against benchmark. Using 2024 emissions data, this allocation generated a 21.5% decline in Global Equity emissions, driven partly by an expansion of the MSCI Low Carbon Target Index from 10% to 21% of the portfolio. The broader low-carbon equity strategy has reduced overall portfolio emissions by more than 16% since inception.
The Fixed Income team adopted a complementary approach in May 2023, implementing a 15% low-carbon credit-related index optimization strategy designed to reduce emissions while maintaining tight tracking error relative to the parent benchmark. This strategy achieved a 9.3% decline in corporate credit portfolio emissions, exceeding the benchmark's own 8.8% decline. Both teams use risk budgeting methodologies to balance climate goals with traditional portfolio management discipline, ensuring that emissions reductions do not compromise risk-adjusted returns or portfolio resilience.
CalSTRS frames its net-zero initiative as a risk mitigation strategy, addressing climate-related threats to long-term portfolio sustainability and beneficiary returns. By embedding decarbonization into existing risk frameworks rather than pursuing it as a separate objective, the pension fund demonstrates how institutional investors can align environmental goals with fiduciary responsibilities and disciplined asset management practices.
Since pledging to achieve net-zero greenhouse gas emissions by 2050, CalSTRS has achieved measurable progress through targeted index strategies across equity and fixed income allocations. The Global Equity team approved a low-carbon equity strategy in September 2022, allocating 20% of total public equity to a low-carbon index. As of March 31, 2026, the fund managed approximately $31.2 billion internally against benchmark. Using 2024 emissions data, this allocation generated a 21.5% decline in Global Equity emissions, driven partly by an expansion of the MSCI Low Carbon Target Index from 10% to 21% of the portfolio. The broader low-carbon equity strategy has reduced overall portfolio emissions by more than 16% since inception.
The Fixed Income team adopted a complementary approach in May 2023, implementing a 15% low-carbon credit-related index optimization strategy designed to reduce emissions while maintaining tight tracking error relative to the parent benchmark. This strategy achieved a 9.3% decline in corporate credit portfolio emissions, exceeding the benchmark's own 8.8% decline. Both teams use risk budgeting methodologies to balance climate goals with traditional portfolio management discipline, ensuring that emissions reductions do not compromise risk-adjusted returns or portfolio resilience.
CalSTRS frames its net-zero initiative as a risk mitigation strategy, addressing climate-related threats to long-term portfolio sustainability and beneficiary returns. By embedding decarbonization into existing risk frameworks rather than pursuing it as a separate objective, the pension fund demonstrates how institutional investors can align environmental goals with fiduciary responsibilities and disciplined asset management practices.
Go deeper than the headline
Research every firm in this story, track the ones that matter and get the daily briefing — free for 7 days.