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A look back at ‘An Inconvenient Truth,’ 20 years later | Al Gore’s famous documentary has mostly stood the test of time.
(yaleclimateconnections.org)
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.
That's what I mean. Virtually everything would be different.
People say Clinton's win solidified the corpo-facist bipartisan agenda. I'm not sure. I thinks Gore's loss did. I think we would have seen a lot fewer mergers and less consolidation, in addition to what you mentioned.