You can easily compare different data series there. Example: http://woodfortrees.org/plot/uah/mean:20/plot/rss/mean:20/plot/hadcrut4gl/mean:20/from:1960/plot/g

You can easily compare different data series there. Example: http://woodfortrees.org/plot/uah/mean:20/plot/rss/mean:20/plot/hadcrut4gl/mean:20/from:1960/plot/gistemp/mean:20/from:1960/offset:-0.3 http://woodfortrees.org/plot/uah/mean:20/plot/rss/mean:20/pl... For example satellite data has only more recent data points.