Not intended as a "gotcha" -- I'm sure I'm just not looking in the right place -- but I'm having a hard time finding the background for this specific Green Circle award, to assess the credibility it might lend to Steven's arguments.
In his Twitter profile, it's mentioned as a 2003 award.
On Earwolf's guest profile, it's from 2006.
On the Connecticut DEP Green Circle recipient page, I've yet to find it. It must be there somewhere.
To the larger point of Science vs "everybody says so," ultimately we layman must rely on the credibility of sources. We can read arguments and counterarguments from those sources and assess for ourselves the validity of claims and rebuttals -- but only to the extent that we have the necessary background and patience.
On topics with such huge economic significance, we may also "follow the money" -- and I gotta say, if the entire fossil fuel industry hasn't yet bought enough science to put this issue to rest for good, man-made* climate change must be very, very real.
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*... and woman-made.