Prepare for my thoughts for this one.
Despite I have very strong opinions about some Ecological stuff, which i won´t discuss here since this is Episode Discussion. This looks tame compare to other Enviomental themed stuff in entertainment media, well most of it is fine: SpongeBob doesn´t want Plankton to make the Highway because of the Jellyfish will lose there home and that´s it. SpongeBob does at times tackle some themes but mostly are just plain speculation from the internet, despite this is obviously an enviomental episode for itself, SpongeBob´s Last Stand is not really a terrible special, which i´ll tackle the most conterversial one later, like i said this is tame compare to others, Wall-E, Fengully, Once upon a Forest, despite i love the Rio movies, Rio 2 has this villain who want to destroy part of Amazon Forest but that isn´t the main focus of that film, just a minor antagonist who wants to cause trouble. However didren´t SpongeBob has the Endless Summer short? However the episode does feel a little slow pasted, but still does move the plot along however i don´t feel it´s fillerish since it all makes sense, Spongebob having fun, he´s sad for what´s going on with Jellyfish Fields, they try to talk to plankton, the song Give Jellyfish Fields a Chance is quite preachy despite the rhyming it has however the part of destroying the highway it´s obviously telling you that you must work together, but this is tame compare to others. So 7.5/10 Good, but a little preachy.