I wanted to make a quick check of the source in the OP so I looked into the "IEA says 3.5 degrees by 2035" claim. It looks to be unsupported. The primary source clearly appears to be the Christian Science Monitor, seeing how most sources either quote it verbatim or link back to it, but try as I might, there's just no indication of there being an actual IEA release to that effect.
Quite the contrary: actual IEA releases seem to predict a much more modest 3.5 degrees by 2200 under current committments scenario.
https://www.iea.org/publications/fr...2015SpecialReportonEnergyandClimateChange.pdf
During the search, I also found indications that the source is plagiarising Mother Jones with that terrifying list of theirs that the 3.5 degrees by 2035 claim is on.
http://www.motherjones.com/environm...nvironment-apocalypse-human-extinction?page=2
Big caveat: I'm not saying there's nothing to worry about - there absolute is. But whenever you see these claims that climate change is proceeding much faster than expected or that we'll reach some temperature decades or centuries earlier than previously thought; be skeptical. Climate scientists are really good at what they do. Their models are pretty much on point, that's not the problem. The problem is the incredibly slow response on a global scale. But even a business as usual scenario is completely unlikely to create a sudden climate apocalypse; rather, it's the slow march towards it by the end of the century that should scare us, because that's when our children and grandchildren will live through it.