Carter did one good thing while in office; he started a comprehensive national energy policy. IIRC, even had solar collectors on the White House.
Reagan dismantled it as soon as he got in office.
Oh, and one other thing I almost forgot about. Carter signed the law that legalized home brewing of beer. (Wine was already legal, but beer technically was not)
"The only way to stop a bad guy with a gun is with a good guy with a gun"