. while the ultimate outcome of ppg 2019s asbestos litigation cannot be predicted with certainty , ppg believes that any financial exposure resulting from its asbestos-related claims will not have a material adverse effect on ppg 2019s consolidated financial position , liquidity or results of operations . environmental matters it is ppg 2019s policy to accrue expenses for environmental contingencies when it is probable that a liability has been incurred and the amount of loss can be reasonably estimated