It's not true that all of a sudden we discovered the world has been warming.

There are numerous datasets that measure earth's temperature, in the US NASA makes land surface observations, the NOAA makes water surface observations (and these are weak, we can't really measure ocean temperature well) while the U of Alabama measures air temperature.

Then you have the UK met office, the German Met office the Australian met office and others. They all make their own measurements.

The NASA/NOAA dataset is the most fuckedup, it shows way more warming than the others and there have been (perfectly valid in my opinion) complaints they've "adjusted" it too much. For example the Mauna Loa observatory shows very different temperatures.

So, some guy wrote a paper and made different adjustments to the NOAA dataset and now by some coincidence there's less error between his results and the IPCC climate model curves which at this point are 75% out of whack.

But, this is just one guys opinion. Now we get to see who salutes it, other workers in the field may find problems with his math or they may find he's right. The latter is unlikely because his numbers are now so out of whack with all the other datasets.

The two problems here are 1) the ocean buoys that have thermoprobes accurate to 0.005C have been found to be 0.5 to 2.0 degrees off because the upper ocean has weird currents and gets hot and 2) the land stations used a paint that wears off in 5 years and when it does they read high.

Stations:
http://onlinelibrary.wiley.com/doi/10.1002/joc.3765/abstract

Buoys:
http://joannenova.com.au/2015/06/study-shows-argo-ocean-robots-uncertainty-was-up-to-100-times-larger-than-advertised/

So these are why the NOAA data is high, it's +/- 2 degrees. Which makes the half degree rise measurement meaningless, it's 4X epsilon from a numerical analysis perspective.

But, it's only half a degree. Study the big chart above, there's a 15 degree difference from where we are now and where the very stable earth aximum has been for 85% of earth's 4.5 billion years.

So. A year from now there will be rebuttal or confirmation of this paper and it still wont matter a damn, the temperature oscillates over any range you want to look at, 2000 years, 10,000 years, 800,000 years or 4.5 billion years. It's always going up and down in