A new internal combustion engine (ICE) that does not generate carbon dioxide and other gases

 https://eandt.theiet.org/content/articles/2020/08/new-internal-combustion-engine-design-produces-zero-harmful-emissions/

According to its creators, it is a “revolutionary” engine that both meets the regulation on emissions planned for 2040 and also has high efficiency. The first two prototype builds of this engine will be produced in the coming months, funded by the Valencian Agency for Innovation.

https://youtu.be/gi7IOXQ7oyo