If you look at the IPCC reports from, I believe it was 2006, they lay out the path necessary to keep warming below 1.5C. It stipulated that GHG emissions would need to be halved by 2010 (they weren't). Then halved again by 2020 (they weren't). And halved again every decade until the 2050s (they won't be). At which point, using unknown and undeveloped technology working against entropy, GHG emissions actually go negative at increasing rates until the end of the century (this is the modern equivalent of where medieval scholars would say "and then a miracle will happen"). Simultaneously, GHG emissions from agriculture would need to drop to zero by 2050 (they've increased). And all this in service of a target of 1.5C of warming which is a nightmarish scenario on its own.
Because we didn't hit those earlier targets, the targets we would have to hit now are even more draconian in nature. If you project forward from what we've actually done, we're looking at 3.5C of warming, which will be utterly apocalyptic. That's not hyperbole; we'd face a collapse of the biosphere similar to the PT boundary event, known colloquially as "The Great Dying" in which something like 90% of species went extinct and the oceans became toxic. Even if everyone met all proposed and agreed upon limits (which no one except the likes of Bhutan has done), we'll still hit 2.5C of warming.
You need to understand three facts about 2.5C. First, the last time the Earth was 2.5C warmer than it is now, the oceans were 27m (89ft) higher than they are now. Second, a quarter of the human population, and nearly half of world industrial capacity, lies on the coasts within 27m of sea level. Third, humans can't breathe salt water.
We're not going to reduce our GHG emissions to zero, let alone take them significantly negative, while simultaneously relocating a quarter of our population and half of our industry. None of the proposed climate actions are even of a scale to that challenge. The Inflation Reduction Act was the largest GHG-reducing piece of US legislation, bar none. Biden does deserve credit for that much. If we did five more of them today, it wouldn't be half enough to hit 1.5C.