"_All_ the studies are measuring the same tendency : the temperature is rising"
There could be lots of reasons for that. Anyway, the temperatures were not always rising, clear temperatures rise was observed in 1930-40s and in 1980-90s. Cooling in 1960-1970s. And yes, prediction has to be precise. If a model predicts rise of 3K in 100years, and you measure 1.3K - your model is wrong. It's even more wrong if you don't take into account any of the natural cycles, even if prediction is accidentally correct.
LOL, no. Denmark used 67.5TWh gasoline and diesel fuel last year, due to better efficiency of the electric drivetrain it's equivalent to roughly 20TWh of electricity. Denmark also used 46TWh electricity last year, so they would need to increase their production by 43.5%. It's quite high actually, for Germany the same figure is just 31% (190TWh and 610TWh).
All data can be found here https://www.statbank.dk/ENE2HA.