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The phrase isn't clear at all, but immediately afterwards they add: "By 2070 the world would have been 4.5 degrees F (2.5 degrees Celsius) hotter, a level most
by danmaz74 9y ago
The phrase isn't clear at all, but immediately afterwards they add:
"By 2070 the world would have been 4.5 degrees F (2.5 degrees Celsius) hotter, a level most experts agree is disastrously high"
So, I assume the actual increase the estimated for a situation without the treaty, in 2017, is somewhere between 0 and 2.5 C.
Perhaps the 25% meant that the increase would have been 25% bigger than the increase we actually had?