Of course Ms Figueres is right. If the world’s governments choose to they can easily achieve the carbon reductions called for by the UNEP, IPCC and similar organisations: provided they can maintain authority over their citizens, anyway.
They might even be able to do so without destroying the world economy, by moving largely to nuclear power. The Fukushima disaster – following which not a single person is set to be measurably harmed by radiation – has shown that nuclear power is safe, and new research strongly suggests that it is sustainable for the foreseeable future too. However, these facts are not widely known and such a course is not being considered by any government.
Unfortunately the alternative, massive use of renewable power, means economic disaster and global poverty; and indeed all the more honest green campaigning groups admit this. They generally suggest that the human race should abandon any aspiration to greater wealth (or even maintenance of the same wealth, in the case of rich nations), and focus instead on some other goal.