The sarcasm was there like gravy on thanksgiving day. 
On turning clearcoats yellow, that's a new one to me. Carnauba in its raw form is indeed a yellow-ish color:
...but will not turn any clearcoat we've ever seen or heard of yellow over time. While a lot of manufacturers use "White" carnauba, this is simply the practice of bleaching or dying in some fashion to make it white. I dont think this is what the poster is referring to by yellowing of the clear coat, but I want folks to know that not dying or bleaching a carnauba to white will not make your clearcoat yellow.
The article that jedi refers to where DavidB denounces carnauba dead is at:
Is Carnauba Paste Wax a Dinosaur?
...it's about a year and a half old or so and is worthy of a read.
Of course too, there's references in the article to VOC's, which can make up a majority of the percentage in less expensive waxes. Those interested in what a VOC is:
Volatile organic compound - Wikipedia, the free encyclopedia

On turning clearcoats yellow, that's a new one to me. Carnauba in its raw form is indeed a yellow-ish color:

...but will not turn any clearcoat we've ever seen or heard of yellow over time. While a lot of manufacturers use "White" carnauba, this is simply the practice of bleaching or dying in some fashion to make it white. I dont think this is what the poster is referring to by yellowing of the clear coat, but I want folks to know that not dying or bleaching a carnauba to white will not make your clearcoat yellow.
The article that jedi refers to where DavidB denounces carnauba dead is at:
Is Carnauba Paste Wax a Dinosaur?
...it's about a year and a half old or so and is worthy of a read.
Of course too, there's references in the article to VOC's, which can make up a majority of the percentage in less expensive waxes. Those interested in what a VOC is:
Volatile organic compound - Wikipedia, the free encyclopedia