It has been a tough year for alarmists, so they needed a fake headline.
In fact, September was a fairly typical month and ranked 11th since 1979 in the RSS satellite record. The graph below shows the divergence of GISS September data from RSS. Since 1995, GISS has diverged at a rate of 1.2ºC per century, or almost 24ºC since the birth of Christ.
When government scientists have no fear of retribution, they can generate any headlines they want by simply manufacturing fake data.