There’s a nearly 100% consensus in peer-reviewed publications to climate science journals that global warming is “real” and humankind has contributed significantly to it. I’ve long felt uncomfortable having an opinion on the subject because frankly I was intimidated by the complexity of the climate system. It felt similar to neuroscience that sometimes attempts to arrive at fundamental conclusions about the human mind from observing which parts of the brain light up when you touch a hot stove top.
Today, I spent about two hours on Google skimming for breadth over depth on the available material on the subject. I was not able to find any scientific studies that (1) deny the unusual rise in temperature in the 2nd part of the 20th century and more importantly that (2) deny that the major contributing factor to this temperature rise is “anthropogenic greenhouse gas concentrations”.
I still believe that the Earth’s climate is an extremely complex system about which it’s difficult to make solid scientific claims (which require some control over or at least knowledge of most of the variables in the system). However, I find it hard to believe that so many intelligent people (following rigorous procedures of collecting data and modeling) could be so wrong. While it’s possible, I wouldn’t bet on it.