I didn't say they did. What we are witnessing is the long lived event of the planet returning to its post glacial temperature. Which will continue to happen until the next glacial period is triggered... like it always has for the past 3 million years.Abrupt ocean circulation changes, volcanic eruptions, or ice sheet collapses can cause regional or short term anomalies, but they cannot account for the sustained, planet wide warming observed over the last century.
It seems that your belief is that absent anthropogentic CO2 the planet would stay at it's present temperature indefinitely. That just isn't the case. LOOK AT THE DATA.
Absent anthropogenic CO2 the planet would continue doing this for the foreseeable future.