Also worth remembering is that climate change isn't really about climate. It's about our society. Earth doesn't care about temperature, and life on Earth will happily survive whatever we can possibly throw at it this century. All that matters is that climate change puts pressure on societies around the world, and with enough pressure our entire civilization will collapse, and you and me and everyone else we know will die a horrible death.
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[0] - There are also environmental feedback loops ready to take over the growth of average temperature that have gained attention recently.
Food pressure, as arable land is lost to the sea and temperatures[0], plus collapsing ecosystems as insects and plants with high vulnerability to temperatures die off. Food prices increase, risk of food shortage increases too, and so does social unrest.
As some land is lost, other land becomes available, "defrosted" by the changing climate. With reduced agricultural capability and migratory pressures, nations will want to compete for both that new land and resources available on it. This could lead to war.
I could elaborate, but let me instead tell you to look at the problem in reverse: think of how little it takes to cause "mass horrible deaths". Most people live in cities now, and most cities are fed "just-in-time", which means there's 3-5 days worth of food in them. Imagine what happens if you break that supply chain for more than a week. Imagine this happening to multiple cities in a country simultaneously.
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[0] - You can't e.g. think that a +4°C Poland can just switch from wheat to bananas. Bananas may like the new summers, but won't survive the winters.
If 4 degrees Celsius of global cooling (relative to the current climate) can cause large parts of the US to be covered by 3,000 feet of ice, then it's not unreasonable to think that 4 degrees Celsius of global warming could have an equally destructive effect on agriculture and society.
