This is stupid and counterproductive. By blaming those companies you make it seem like you could solve everything by just shutting them down.
And if we are looking for the "source" why not blame the Earth itself? After all one Earth is responsible for 100% of emissions.
This is no "blaming" it's an assessment of the most polluting companies in the world, and given that the one of the goals for the future is to reduce emissions worldwide they will bear a great responsibility to do so. Or are you proposing that we should just let go on as usual?
"Source" as in producers - the energy they produce is used by the entire world.