Really? Or does no one care to investigate what they are. Are we a bit like newspapers who think only bad news is real news.
I think because climate change (drastic) scenarios mean the end of humanity as we know it, there is desire to be real with that, than paint a rosy picture of the planet, which will most certainly survive under human induced climate change.
To me, the discussion is usually about a few things. One is the little things each / all of us can be doing today that is different from perhaps yesterday and that would reverse the path toward extinction. This is where the politics and partisan stuff comes up in spades. Like, I don't get how a POTUS who makes this a big deal can justify flying around in Air Force One, and sleep well - other than being told that it is perfectly justifiable from those on his partisan side and that there are bigger fish to fry. But, it certainly tells me that as long as that is occurring, I really need not go overboard in all the teeny tiny things I may adjust. If I were instead to see POTUS treat that as BFD, I would see hypocrisy is being removed, to some degree, from the equation and a sense of consistency is called forth.
The other thing is the drastic, overall scenario used as a scare tactic to implement monumental changes. Also political, but not necessarily. It's akin to whatever a doomsday scenario is presenting and essentially trying to communicate you have reason to be fearful and there's either nothing or very little you can do about this. It's out of your individual control and did we mention that fear is suddenly a good thing to have allegiance to?
There's a factor that wishes to uphold the righteousness of science. I don't think I can do this factor justice in one paragraph. I don't think it's the primary factor and is why I list it third. I do think science is partially to mostly responsible for getting us to this point, but realize how debatable that is, and so rather just leave this point as short as I am.
But I do think the third factor is balanced by the other factor which is resistance to the notion of climate change on various levels or points being made. I think that resistance is a good thing, but like all things with consensus where politics is involved, the minority position (resistance) will be downplayed and ridiculed constantly. This last factor though is helped each day when a prediction from 10 to 30 years ago turns out to be inaccurate. Kind of like how if a religion claims the world will end in 1999, and there is resistance to that, and then when it comes to pass, the consensus around the religious position is that it's still going to end, just that we didn't get it right, so allow us now to use ad hoc explanations to further convince that the end is near, and surely we can be trusted to convey that information. I find it good to have healthy skepticism around anything related to drastic scenarios regarding climate change.
Which to me, is about the most positive thing that there is on this (broad) topic. That and the fact that man made climate change is inherently a natural occurrence.