Seems like the populations of each tier should be increasing as you go down. It's hard to imagine most people in the world are on the second-highest level.
Climate - truthful information about climate, related activism and politics.
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:
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Maybe another way to interpret this is that the third level is currently only showing those who are alive.
Trickle down economy or something idk... Eat the rich
It's a reference to current floods and climate extreme events. It's a bleak reminder that we won't face the climate crisis equally, and that the one who are causing the most environmental damage are the ones who won't face any of it's consequences.