Jim: There is one stock that tends to go higher whenever there's a horrific natural disaster, a real national tragedy, then these bad things happen, because of the underlying companies cleaning up during the aftermath of a tragedy. Take this brutal deadly tornado in the suburbs of Oklahoma City that's displaced something like 10,000 people. When I hear something like this, my first thought is of course the hope that everyone affected will be okay, because there are in fact more important things than money... even though that's not what we usually talk about on Mad Money.

My second thought? Clean Harbors, CLH. That's the largest hazardous waste disposal outfit in North America. It's a company that almost always plays a huge role in both natural and manmade disaster relief. We know these kinds of tragedies are going to keep happening. That's just the way things are. It's unfortunate, but it's the way things are. Clean Harbors will always be there in the aftermath, that can help things get back to normal, and can clean things up.

All of that said, Clean Harbors is about far more than disaster relief. The company also cleans up after dirty industries, with the largest one being the oil and gas space. It accounts for 40% of their business if you count exploration, production and refining. Plus, Clean Harbors recently acquired Safety-Kleen, another hazardous waste firm that's the largest...

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