If you assume the rosiest scenario: a linear rampdown of _all_ emissions (not just from electricity generation) to zero by 2040, we still blow post our carbon budget to stay below 1.5C warming: 42 Gt/yr * (15 years / 2) = 315 Gt (compared to our "remaining balance" of 170 GtCO2 before >50% of 1.5C warming). Needless to say even this optimistic scenario has no chance of happening.

So the answer is that for your children, wars of imperialism will be replaced by wars for water, arable land, fisheries, etc. along with varying levels of violence that will meet the mass migration of refugees. How bad it will be will depend.