The core belief of Pantheism is that God and Creation are not seperate (a'udhu billah). It's in the etymology of the word. This belief has no place in Islam and is completely contrary to Monotheism. Reverance for nature has nothing to do with being a Pantheist, they're not mutually exclusive subjects. Nor is it a requirement of Pantheism that you worship or revere nature; merely that you believe creation is indistinguishable from God (a'udhu billah). I personally respect the environment and creation of Allah because it's something a Muslim is supposed to do. Not because I believe Nature has any inherent value or importance.