I had no sympathy whatsoever for this character.
His motivations made sense, being furious about impending collapse of ecosystems due to human activity, but his goals were so nonsensical! "Damned humans will make the earth unliveable in 100 years. My solution is to make the earth unliveable in 5 years instead. That'll teach them!" What kind of insane person comes up with that solution?!
And his arguments with the doctor, which were supposed to garner sympathy of some kind, I guess, just further justified his being cryofrozen to my eyes. So even though he's failed he's convinced that some other moron with a vendetta and no brain cells in their head is going to carry out his quest, and the reason he doesn't want to be frozen is that this other person carrying out this quest will kill this guy in the process. Good! His plan was to quickly kill 95% of the earth's population, and now he's trying to get sympathy because he's no longer going to be in the other 5%? He really thought that would gain sympathy?
So yeah, no sympathy whatsoever, and without sympathy, it was hard to care much.