In this case, more than 90% of the people that study this for a living seem to say it is happening.
The couple of times I've looked deeper into that sort of claim, they've gotten that number through subtle manipulation. It's actually been "90-whatever % of those
who took a firm stance" and not of the total.
In other words:
90 surveyed scientists said "There's definitely dangerous climate change being caused by humans."
10 surveyed scientists said "There's definitely not dangerous climate change being caused by humans."
X surveyed scientists said "I cannot definitively support either position with the current evidence."
How many was that X? 2 scientists? 10,000 scientists? Usually you have no idea. Often we don't even see the "of those who took a definitive position" part - it's buried subtly within the full report so that the journalists who write about will miss it, and thus we then read articles where it isn't included.
My stance is that the science may not be settled. But, to ignore the science and the potential for harm that we're causing is foolish. Seems like a fairly reasonable stance as compared to the poles split between Al Gore and Scott Pruitt.
Seems reasonable to me. If the argument was more often "The potential to harm exists so let's take precautions." and less often "You clearly are anti-science and don't give a crap about the environment, you DENIER!"then it might get somewhere more effectively.
Honestly the debate over something so clearly uncertain and complex and difficult to prove always seemed weird. I think it has detracted from putting those energies towards fixing stuff we can all agree is bad and is undoubtedly happening: dirty air, dirty water, dumping toxins, littering, etc. But then again maybe that still gets nowhere because nobody can agree what the most effective ways are to combat those things - and then we get back into the common "I believe government should do X to stop it" "I think that actually wouldn't help" "I ignore what you said and just pretend you hate the environment." type of argument that infects pretty much every single issue.
If we really wanted to combat air pollution, we'd start replacing oil, gas, and coal plants with nuclear plants. And if you disagree with me on that, obviously it's because you don't like clear air and don't care about the lower-income children who are choking when they breathe.
