Draw some item from the piece, or something you find missing from it. It helps as well to have some store of concepts or ideas that you'd like to see thrown into the discussion. Recent example of mine (first comment to the post it was submitted to at the time: <https://news.ycombinator.com/item?id=37267188>).
The other element of this story is that climate change is a difficult narrative to convey freshly. That's in part because the story is bog simple: humans have and are spewing far too much CO2 and other greenhouse gasses into the atmosphere, the consequences will be absolutely catastrophic, they're showing now, and we must stop doing this as soon as possible. But it's also because the story is diffuse, slow, bound up in myriad details and specifics, and most of all, is a tremendously inconvenient truth to exceedingly powerful and recalcitrant interests.
Somewhere in that should be threads to spin a compelling tale, however. It tends to take time both to develop those and for someone who does have an interesting and insightful take to find and respond to a piece.
"Be the discussion you want to see on the Internet."