2 Below Honey

I contacted Van's people and sadly its a no go. I guess global warming is too hot of a topic for Van (pun intended).

I am not a lawyer, but you should consider appealing via YouTube's process if that is still available under the claim of fair use.

If you've got $75, talk to a lawyer for 1/2 hour.

Mention Campbell v. Acuff-Rose Music (92-1292), 510 U.S. 569 (1994).

See also article on Weird Al Yankovic at Wikipedia. Al Yankovic does get permission, but as a courtesy, it seems. (Wikipedia is not exactly a lawyer either...)

Under the "fair use" provision of U.S. copyright law, affirmed by the United States Supreme Court, one does not need permission to record a parody.[36] However, as a personal rule, and as a means of maintaining good relationships within the music community, Yankovic has always requested permission from the original artist before recording his parodies.[6] Most artists have had positive reactions to Yankovic's parodies. Several have considered it to be something of a badge of honor to have Yankovic ask permission to parody their song or style, since they felt that Yankovic would not choose to do so unless they were a success or had made an impact on the music scene at the time. However, there are a few notable exceptions where people have not allowed parodies or have otherwise withdrawn permission.

Your song was really climbing in terms of view count.

You might consider putting another one up, with the sound disabled, and the lyrics in closed captioning....with a banner that repeatedly states "Van Morrison/Exile productions doesn't want you to see this video" constantly scrolling across the screen.