The Paris Climate Accord goal of limiting temperature rise to 1.5 Celsius was to prevent runaway climate change (the world is currently at a 1C increase above preindustrial temperatures ).
The study authors did note that humanity can avoid the loss of the Antarctic Peninsula by keeping temperature rise to the Paris goal but, unfortunately for us, a 1.5C rise is already locked in and, we are well on our way to blowing past the 2.0C warming that scientists say will be catastrophic.
The Antarctic Penninsula is one of the areas on the planet that is warming faster than the rest of the earth. In the past 50 years, the peninsula has warmed almost 2.5 degrees Celsius (three times faster than the rest of the planet), the only area warming faster is the Arctic. The peninsula juts North toward South America (and, is the krill nursey of the southern hemisphere), making the region more susceptible to warming than the rest of the continent.
The Antarctic peninsula is the canary in the coal mine for the rest of the continent, and it is in trouble. Scientists have warned that under a global temperature rise of 1.5 Celsius, radical changes to the ecosystem will become observable and irreversible.