Yes, I do accuse them of being biased. Particularly when you consider the history of the Heartland Institute. An organisation that has a record of being funded by the fossil industry. An organisation that has a history of supporting the tobacco industry.
https://www.theguardian.com/environment/2012/feb/15/leak-exposes-heartland-institute-climateHow come there are thousands and thousands of scientists from all sorts of independent scientific bodies that do not agree with these four ' climate scientists ' ?
Four guys that just happen to work for a fossil funded group. 
If you want to take a snapshot of earth from millions of years ago and use that argument that those conditions are in any way relevant to human life on earth on 2019 then you are clearly on drugs.
Note the scale.
Millions of years.Not 50 or 100.
Who cares if it was warmer millions of years ago ? Who cares if CO2 was at 2000ppm millions of years ago. All very interesting data to help us understand the history of the earth but what has it got to do with today ? The earth environment then was completely different to what it is now.
Now we have 7+ billion humans to house and feed every day. Do you think the greening of Antarctica, melting all the ice on earth and releasing huge amounts of methane into the atmosphere won't have a significant effect on human existence ? Particularly if we do it unnaturally fast .
