Do any global warming deniers nonetheless still feel concerned about human-caused environmental damage?

Most of them either don't know or don't care. In a society that's overrun by oil tycoons a lot of the information is kept from us. Also, those bureaucrats in Washington are trained to think like oilmen in that the environment will recover. Others believe that a catatonic event won't occur in our lifetime. They expect to leave the responsibility for the next generation to deal with.