What will it take to hold the +1.5°C line?

At Davos, we believed that a serious discussion of “What will it really take to hold the +1.5°C line” needed to happen. A failure to look clear-eyed at the science behind these transition plans will be disastrous for the future of humanity, as the likelihood of limiting global warming to 1.5°C is already vanishingly small. How can closer and transparent discussions with the youth and scientific community provide a reality check on what it really takes to hold the 1.5°C line?