I think we are probably right about climate change (as to many things), but there is no "full stop" in science. It's worthwhile to read about the state of physics in the late 19th and very early 20th century. People thought physics was "done"--until relativity and quantum mechanics completely upended everything.
The "international agreements" we have in place are not strong enough to address climate change. Not even close. To hit 1.5C we have to have zero net CO2 emissions by the middle of the century: https://www.carbonbrief.org/analysis-why-the-ipcc-1-5c-repor.... But under current projections, CO2 emissions will keep going up until the middle of the century: https://www.eia.gov/todayinenergy/detail.php?id=26252. (China has added more than an entire US worth of CO2 output in the last decade. If India gets up to Chinese levels, much less Western levels, that will add another US or more. The population of africa is expected to double by 2050.)
I am doubtful there is any way to hit any of the IPCC targets, period, but certainly not within any of the international frameworks we have today. Any supra-national political structure capable of actually addressing climate change would be massively more invasive than anything we have today.
The "international agreements" we have in place are not strong enough to address climate change. Not even close. To hit 1.5C we have to have zero net CO2 emissions by the middle of the century: https://www.carbonbrief.org/analysis-why-the-ipcc-1-5c-repor.... But under current projections, CO2 emissions will keep going up until the middle of the century: https://www.eia.gov/todayinenergy/detail.php?id=26252. (China has added more than an entire US worth of CO2 output in the last decade. If India gets up to Chinese levels, much less Western levels, that will add another US or more. The population of africa is expected to double by 2050.)
I am doubtful there is any way to hit any of the IPCC targets, period, but certainly not within any of the international frameworks we have today. Any supra-national political structure capable of actually addressing climate change would be massively more invasive than anything we have today.