Even amateur «scientists» have replicated the global rise in temperatures using as little as 10 % of the station data because there is a global warming signal in the data. (skepticalscience.com)
For example a paper on measuring the global warming signal in the instrumental temperature record may say nothing about the cause. (skepticalscience.com)
Our system predicts that internal variability will partially offset the anthropogenic global warming signal for the next few years. (realclimate.org)