A couple of years ago Richard Muller entered the public debate on global warming. Making some very strange claims about the current temperature records and some extremely harsh accusations towards climate researchers. This of course made him a hero among climate science deniers.
He started the Berkeley Earth Surface Temperature project to double-check the existing temperature records and answer the, to him, valid criticisms of existing temperature reconstructions. It was no surprise to the climate research community that Muller confirmed that global warming is real and that the only plausible explanation is the increase in greenhouse gasses. This hasn’t endeared him with the climate science deniers.