My attention has been drawn to this, by Anthony Watts:

Video analysis and scene replication suggests that Al Gore’s Climate Reality Project fabricated their Climate 101 video “Simple Experiment”

I would like to scrutinize it myself, but

Nad oes ynof nerth na bywyd
Fel yn gorwedd yn y bedd

I have no strength or life
Like one lying in a grave

so I would be pleased if any readers could give their verdict.