The recent determination of the local value of the Hubble constant by Riess et al , 2016 ( hereafter R16 ) is now 3.3 sigma higher than the value derived from the most recent CMB anisotropy data provided by the Planck satellite in a \Lambda CDM model .
Here we perform a combined analysis of the Planck and R16 results in an extended parameter space , varying simultaneously 12 cosmological parameters instead of the usual 6 .
We find that a phantom-like dark energy component , with effective equation of state w = -1.29 _ { -0.12 } ^ { +0.15 } at 68 \% c.l .
can solve the current tension between the Planck dataset and the R16 prior in an extended \Lambda CDM scenario .
On the other hand , the neutrino effective number is fully compatible with standard expectations .
This result is confirmed when including cosmic shear data from the CFHTLenS survey and CMB lensing constraints from Planck .
However , when BAO measurements are included we find that some of the tension with R16 remains , as also is the case when we include the supernova type Ia luminosity distances from the JLA catalog .