“net-zero” means that once all greenhouse gas emissions from humans are eliminated”
That is simply not attainable, by 2050 or otherwise. No matter how energy production and use is reoriented human activity is always going to produce some CO2.
Instead of chasing after CO2 it will be less costly and more efficient to use our scientific, technological and engineering know how to adapt to, and mitigate effects of “climate change”, observing that change over time and investing for adaptations and mitigation ONLY as observable change demonstrates the needs for that.
Humans can adapt; LIFE writ large on earth will.
Humans can adapt
I'm still waiting for our metabolisms to adapt to an era where food is abundant and obesity kills more than starvation (in the US at least).