If recent warm periods (or interglacials) are a guide, then we may soon slip into another glacial period. (realclimate.org)
I reproduced your graph here (basically the same except it has a coarser smoothing algorithm), then produced a graph covering only the recent warming period: (1975 - 1985) to (1995 - 2004), shown here. (realclimate.org)
It is only for the urban stations that the recent warm period seems «unusually warm». (globalwarmingsolved.com)