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Class war solves most issues
(lemmy.nz)
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.
No. You are overestimating the income distribution in the world. The 10% worldwide threshold is a out 70k USD ppp, see: https://wid.world/world/#tptinc_p90p100_z/US;FR;DE;CN;ZA;GB;WO-PPP/last/us/k/p/yearly/t/false/0/200000/curve/false/country
2/3 of that would be 46k dollars. In which "developed" country in Europe would that be the poverty line? Poverty in German, iirc is around 20k euros.