I won't keep you in suspense: I've seen less crap in a public outhouse.
Stylistically, it's a blend of pseudo-animation, and live footage with heavy-handed effects. The 2D animation in which elements in the still drawings are moved about the frame as well as moving the camera perspective give it a false 3D flavor reminiscent of the "animated" comic book version of the graphic novel The Watchmen. That same apocalyptic feeling permeates the show as well; despite interviews with seemingly dispassionate scientists and thinkers in the cutaway scenes, Earth 2100 fails to hide its hyperventilating global warming / climate change hysteria.
Experts say over the next hundred years the "perfect storm" of population growth, resource depletion and climate change could converge with catastrophic results.It's unabashed eco-agitprop. It plays the same worn out refrains that liberal extremists have been harping on for years, despite evidence to the contrary: global warming, ecological disaster, global disease, population control, famine, and societal meltdown -- all due to humanity not heeding the warnings in time.
The show is presented with a narrator voice-over in graphic novel style; it asks us to imagine the horrors in store for us in "what if" style -- but the "if" is spoken very softly and the predictions have the force of unstoppable prophecy.
As entertainment, it was mildly amusing but I've seen better doomsday stories. As a political agenda masquerading as pseudo-science it's laughable and awkward.
You're better off watching re-runs of the A-Team.