Cramer's 'Mad Money' Recap: Green Market

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"We tend not to think of the U.S. Supreme Court as a way to make money," and usually that's right, Jim Cramer told viewers of his "Mad Money" TV show Monday.

However, on April 2, a Supreme Court decision against the U.S. Environmental Protection Agency has turned this whole theory around, he said.

The state of Massachusetts sued the EPA for not regulating carbon emissions from cars, Cramer explained. The court then ruled that the agency has the authority and responsibility to mandate these issues. And now the EPA "must regulate carbon dioxide emissions," which means there is "pressure for companies to become more green," he said.

"Nobody's going to change because it's the right thing to do ... but now it's no longer economical to do the wrong thing," Cramer said. "This decision makes investing in clean energy smart."

Now that the rules have changed, if a company is green "it's time to take a second look" at it, Cramer said, because "this decision puts a higher multiple on everything green."

Because "green stocks" are about to get more expensive, Cramer said he needs people in them. He said he is marking April 2, the day the Supreme Court handed down this decision, as "Green Day" and is denoting an entire weeklong series to Green Day.