An interesting article at The Washington Post looks at 1,200 possible scenarios regarding our planet's future climate (using the semi-arbitrary year of 2100 as an end point). Most of the scenarios result in a global mean temperature rise of 2-5 degrees Celsius, widely considered to result in ominous or even extinction-level effects.
Of the "hopeful" scenarios, only 112 result in an increase of 1.5 degrees Celsius or less by 2100. The components of the scenarios (see the link for detail) involve such things as CO2 removal, decreased CO2 production, changing energy demand, reducing methane production etc. If you narrow down the choices that permit "reasonable assumptions" about human behavior, there are no paths to keeping the mean temperature rise below 1.5 degrees Celsius.
I'm in the "doom and gloom" camp. I don't think humans will do anything meaningful. I think the people who have the power to effect meaningful change will not do so; they will continue to "kick the can down the road" hoping a future generation will solve the problem. This includes businessmen, politicians, and individuals. The former two groups will come up with multi-year "plans" but not allow their company or country to suffer while they themselves are still in power. Adult individuals will remain either ignorant or indifferent because the latter years of the century are beyond their lifespan.
And I often wonder if in fact we have already gone past a "tipping point" but nobody is telling us that because they don't want the global public to panic.