Climate Change

A comment I found on a blog somewhere that I thought needed repeating:

"Simply look at the surface data of GISS /www.giss.nasa.gov/data/update/gistemp/station_data/> and try to find something reliable in the tropics:
Look e.g. to the data for Salvador, a town of 1.5 million inhabitants. That should be compared with rural stations to correct for urban heat island effect. But the nearest rural stations are 458-542 km away from Salvador (Caetite, Caravela, Remanso). And their data are so spurious, that it is impossible to deduct any trend from them. Quixeramobin is the nearest rural station with more or less reliable data over a longer time span, and shows very different trends than Salvador. Or look at Kinshasha (what a mess!), 1.3 million inhabitants, Brazzaville (opposite the Congo stream), and something rural in the neighborhood (Mouyondzi – 173 km, M’Pouya – 215 km, Djambala – 219 km,…). East Africa is not better: compare the “trends” of Nairobi with these of Narok, Makindu, Kisumu, Garissa,… Rural data trends with some reliability on a longer time span are very rare in the whole tropics. Only expanding towns have (sometimes) longer data sets which are hardly correctable. The unreliability of the data in the tropic range is thus obvious, that one can wonder how a “global” surface temperature trend can be calculated to any accuracy… But temperate or polar Russia is not better. All but one rural station ceased operation in 1980 ( I imagine this was caused by Russia's near economic collapse about that time). What is left are large cities like Moscow and St. Petersburg (heat islands)

How can the CRU brazenly claim (global) warming with more than half the world's info completely missing?"

Would any passing warmists care to address this query?