It's my understanding that their constitution was intended to be regularly updated, with things being added, modified or replaced as the needs and sensibilities of the times changed.

When it was written, nobody could have fathomed that one might need to specify the right to a stable climate, because humans couldn't modify the climate.

Now, we can, and have, in horrific ways.

So, it's reasonable to consider adding this right to their constitution, unless you don't think people have a right to, well, life. As the climate changes, a great many things change to make simply staying alive more and more difficult, not to mention trying to have a functioning life at the same quality level, in the midst of extreme and more regularly occurring climate change caused wildfires, droughts, floods, etc etc.