The Pacific Decadal Oscillation (PDO)Such as?Natural variations act on timescales of less than 30 years too.Of course not. If there's any ignoring going on, it's on the part of the denialists. They ignore the time course of natural climatic changes that usually develop over tens to hundreds of thousands of years versus AGW theory which postulates that human activity has effected the climate over a matter of a few hundred years.Are you ignoring the natural climate variations which are known to have existed and were not driven by atmospheric CO2?Certain gases are known to absorb infrared radiation. The concentration of those gases in the atmosphere has been rising, since the advent of the Industrial Revolution. Therefore, if the trend continues, warming is inevitable.