iShares Trust iShares Paris-Aligned Climate Optimized MSCI USA ETF (PABU) seeks to track the MSCI USA Climate Paris Aligned Index, which measures U.S. large- and mid-cap stocks while reducing carbon emissions intensity by at least 50% compared to the parent MSCI USA Index and aligning with Paris Climate Agreement temperature goals.
How It Works
PABU uses a rules-based, market-capitalization-weighted approach that systematically tilts away from high-carbon-emitting companies while maintaining broad sector diversification. The underlying index applies climate optimization techniques including reducing fossil fuel exposure, increasing clean energy allocations, and targeting net-zero emissions by 2050. Holdings are rebalanced semi-annually to maintain climate alignment while preserving similar risk-return characteristics to traditional broad U.S. market exposure.
Key Features
- Reduces portfolio carbon footprint by at least 50% while maintaining broad U.S. market exposure across sectors
- Aligns with Paris Climate Agreement temperature targets through systematic fossil fuel underweighting and clean energy overweighting
- Recently launched in 2022 with 0.00% expense ratio, making climate-conscious investing accessible at minimal cost
Risks
- This ETF can lose value if climate-focused companies underperform traditional energy sectors during commodity price surges or economic cycles favoring carbon-intensive industries
- Sector tilts away from traditional energy and utilities could create performance gaps versus broad market during periods when these sectors outperform
- As a broad U.S. equity ETF, it will decline during market downturns, potentially losing 30-40% in severe bear markets like traditional stock funds
Who Should Own This
Best suited for ESG-conscious investors with 5+ year time horizons seeking core U.S. equity exposure (20-40% of portfolio) while reducing climate impact. Medium risk tolerance required due to equity volatility and potential sector concentration effects. Ideal for investors prioritizing environmental alignment without sacrificing broad market diversification in retirement or taxable accounts.