Personally I'll leave the debate about how much humans are influencing climate to the climatologists - I've taken courses in atmospheric science but it's definitely not my specialty. I do think any comparison that starts with "since 1998" is a bit questionable though, since that year is a fairly significant outlier due to a strong El Nino.
I think both sides of the debate tend to miss a fairly important question, however: what is the ideal climate? If we'd be in a cooling trend without anthropogenic contributions, I'm not sure that would necessarily be a good thing. Maybe we should be working towards figuring out what the optimum climate is (i.e. allows the best use of the largest amount of available land). I doubt if the science is anywhere close to being able to tell us the amount of greenhouse gasses we should emit to achieve that climate, but at least it might tell us what direction we need to be going.
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