I don't doubt that that is necessary, but I'm not sure that would be sufficient. Like, if everyone in the US switched to electric heat/cooling and went vegetarian, does that make up for China, India, and Africa?

I feel like I want a Drake equation for climate. Number of petawatt hours / year, number generated by fossil fuels, how much it needs to decrease (or have its growth slowed) to reach 1.5 degrees by whenever... but something simple that larger amounts of people can understand.

Some numbers from Saul Griffith at Otherlab:

Decarbonizing with massive electrification will bring about a new American abundance. https://medium.com/otherlab-news/decarbonization-and-gnd-b8d...

How do we decarbonize? We don’t need a miracle. Everything we need to solve climate change is already here. https://medium.com/otherlab-news/how-do-we-decarbonize-7fc2f...

Green New Deal: How much does fixing climate change cost the US? A real-world argument with numbers you can check for yourself. https://medium.com/otherlab-news/green-new-deal-how-much-doe...

Why do you think only people in USA would switch?

Although they create 10x more CO2 than average iirc.