this cooling abruptly reversed about 150 years ago

By analyzing pollen and marine fossils,geologists can tell that temperatures peaked about 6,000 years ago,before another shift in Earth orbit caused renewed cooling.So what's coming next?Based on the repeated natural cycle seen in the climate record,we're normally expect the Earth to continue a trend of gradual cooling for the next few thousand years.However, this cooling abruptly reversed about 150 years ago.