Motley Fool: Climate change has been getting a lot of airtime lately, especially in the wake of President Obama's sweeping speech on the subject last month. Many companies have been increasingly engaged on the topic, talking more about the risks and opportunities their businesses face from the effects of a warming planet. I've been talking a lot about climate change, too, specifically advocating for the notion that investors need to take it into account in their overall stock analyses. Judging from readers'...