David Holmes can't be this stupid. With that said, as a PR hack, his expertise is lying miscommunications, as some cynics would venture.
How badly did he lie about miscommunicate about the human influence versus natural influences on climate change and global warming you ask?
How about the fact that the sun bombards Earth with an equivalent of 1,950 Hiroshima atomic bombs per second - hmmm...do I have your attention now?
So, global warming alarmists communicators like David Holmes tell us not to worry about 1,950 nukes per second, but for sure the 1,950 + 4 bombs are the "for sure" climate killer.
FWIW, the 4-nukes-per-second AGW hysteria meme has been thoroughly debunked here, here, here, here, here and here.
Note: Source of atomic bombs image.