Draw a 100 mile atmospheric time line on the ground. The last quarter inch would represent the last 100 years' I can certainly see how a global trend could be seen there.
Totally this. ADD to this that about 90% of the last quarter inch was documented with instrumentation that would be considered substandard by today's standards. Also, global warming is a computer model, and the performance of the real system is stubbornly disobeying the computer model. It would be funny if the alarmists weren't so serious.