The Bache Clean Air Composite holds commodities that are directly related to reducing the effects of climate change. These include carbon emission credits, which are used to ration the emission of carbon dioxide, and certain metals that are critical components in products such as catalytic converters that reduce emissions of greenhouse gases such as nitrous oxide. The Bache Clean Air Composite is currently weighted 70% in carbon credits and 30% in greenhouse metals. These weights are based on estimates of relative liquidity. Over time, the Bache Clean Air Composite is likely to add more commodities that play a role in reducing the effect of climate change.

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