Happer has previously argued that "the demonization of carbon dioxide is just like the demonization of the poor Jews under Hitler"
![](https://pbs.twimg.com/media/Dz2oBHZW0AE6heW.jpg)
to Breitbart: mediamatters.org/blog/2015/12/1…
mediamatters.org/blog/2015/12/1…
assets.documentcloud.org/documents/2642…
![](https://pbs.twimg.com/media/Dz2p9wtWoAICKDh.jpg)