Oh no!, not the productivity!
Climate
Discussion of climate, how it is changing, activism around that, the politics, and the energy systems change we need in order to stabilize things.
As a starting point, the burning of fossil fuels, and to a lesser extent deforestation and release of methane are responsible for the warming in recent decades:

How much each change to the atmosphere has warmed the world:

Recommended actions to cut greenhouse gas emissions in the near future:

Anti-science, inactivism, and unsupported conspiracy theories are not ok here.
Those numbers seem low...
I don't think this is the only mechanism by which global warming kills
Would this increase or lower CO2 emissions?
It lowers the chance of a successful revolution, thus increasing expected CO2 emissions.
Lower I guess, but depends who's dying.
Rich boomers that use lots of resources: significant lowering.
Poor developing nations elderly and infirm: barely noticeable?
~500,000 additional deaths by 2050 ain't gonna do much to move the needle unless it's all the billionaires and the 0.1% - we live on a planet with ~8,300,000,000 people and that's expected to hit around 10 billion by 2050.
It's the latter who will die mostly; the well-off largely install air conditioning.