Climate Change and Berkshire's Investments

The question comes from Rory Holshier in Galena Illinois this question is about Berkshire's investments and climate change. How do these and other Berkshire investments align with your understanding of the risks and opportunities posed by climate change how should we think about this as investors? Well I mean if you own a railroad it's carrying a lot of coal it'll probably carry less at some point but that's very likely to. We will continue to use coal in our coal generation plants until the utility commissions under which we operate tell us that we should do something different.