As I think I've said before, I don't like this version of "human rights". I like the version of the US constitution, most notably the First Amendment: Congress shall make no law respecting an establishment of religion, or prohibiting the free exercise thereof; or abridging the freedom of speech, or of the press; or the right of the people peaceably to assemble, and to petition the Government for a redress of grievances. This is "rights" as it should be done: by preventing govt f*ck*ng around with you. That way, you don't have to worry what the phrase "human right" even means. But when you end up deriving a "right to climate" from the state had clear obligations to protect the environment under Articles 2 and 8 of the European Convention of Human Rights involving the right to life and the right to a private and family life then things have, in my opinion, gone wrong. Read my insightful review of Ann Leckie's The Raven Tower for more.
And, of course, I think the whole targets idea is wrong.
On the overall concept, which is citizens suing their govt to do something, I think that is intrinsically weird. Holland is a democracy. They elect people to represent them. Attempting to manage govt through the courts is odd. The courts should be a check on the abuse of power by the govt; and on the govt over-stepping its authority; but I don't like them being used to prod the govt into action. In that case, your remedy is to get another govt. If you reply is "but a different govt wouldn't act either" then my reply is "that is telling you something rather important". The only counter argument to this is that it acts to prevent govt lying: if they've got in by saying they'll do X, then I have some sympathy with the courts forcing them to do X. But I don't think that applies in this case.
* Reading of the Urgenda Verdict - QS