It looks like we are already about at 400ppm if we cut emissions down to 20% of current amount we'd still see a 50% chance of 2 degrees Celsius rise in avg temp

It looks like we are already about at 400ppm if we cut emissions down to 20% of current amount we'd still see a 50% chance of 2 degrees Celsius rise in avg temp. Geoengineering seems like a foregone conclusion to me.