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Tech bros holding flashlights under their chins: Guys, what if le Skynet, what if le Gray Goo??!!
(hexbear.net)
WHAT IF OUR AUTO-COMPLETE CHATBOTS DECIDE TO KILL OFF HUMANITY BEFORE WE EVER BECOME A TYPE 1 CIVILISATION 
Climate change: 
There's nothing about climate change that makes it unsolvable by technology. It's more that the economic and political systems we have in place now are not capable of developing and using it in time, because combating climate change through anything but slow incremental improvement is not something that can be privately profitable.
Economic and political systems are also technology in the broadest sense.
What I mean is they think it can be solved by electric cars and carbon capture with zero cut backs and no need for political or economic change. Just need the right engineers with the right tools and everything will be fine etc etc