Yes, the "it's a hot day in summer therefore climate change" annoys me as much as "it's a cool day in winter therefore no climate change." Any given year, or ev

Yes, the "it's a hot day in summer therefore climate change" annoys me as much as "it's a cool day in winter therefore no climate change." Any given year, or even span of a couple years, isn't enough, let alone a day in a particular region. As for your questions, dealing with them individually with some level of certainty isn't too bad: I've certainly read convincing discussions of them. It's when dealing with things not in isolation that things become tricky. Most (though not all) feedbacks point in the positive direction, so all together they are almost certainly positive, even if that's not mathematical proof. But the magnitude of that positivity is very much up in the air.