"Must be"?And recently-- way since 2007, when the Danish group did their study--They continue to see that it's manmade CO2 that must be the reason for tipping our planet over the edge.
Not scientific proven fact.... in absence of fully understanding the big picture, these folks feel it "must be" man's fault.
Sound like back in the days when the best and the brightest thought that the earth was flat. Sailors left to explore the edges of the flat earth and when or if they didn't come back, they were thought to have fallen off the edge. The scientist felt it "must be" the reason why they were lost.
Of course, we now know that there are a thousand possible reasons why the explorers didn't come back.......
It is amazing what some folks come up with in absence of a full understanding of a phenomenon.
The same dumb thinking would condemn a hispanic man who was found not guilty of murdering a black person by a jury of all women, presided over by a female judge..........
Dumb thinking is blaming white men.