What years are used to determine the historical average? I noticed if you set the birth date to 1910, as low as it goes, it looks like it all evens out.
And there has been absolutely no advancement in science and our understanding of climate since the 1970's. The goal of science is further understand and explain reality. So with new technology and better data collection, the sum of knowledge becomes more intricate and complete.
For example, In the 70's the thought of a human retrovirus was considered an absurdity, about a decade later we had a more complete picture and understanding of HIV.
And who is to say science will not advance again and prove us fools?
I'm all for 'saving the planet'. It is just hard to take it serious when you have leaders of the movement buying 10,000 sq ft homes and jet-setting around the world. Yet we should all sacrifice.
Did you miss the scale at the bottom of the page?
We're already about 1 degree Celsius above the historical average, if you actually wanted to see what another half a degree will do, you could try reading the UN climate report explaining just what 1.5 degrees means for the world.