Truly any argument against being 'too' alarmist, in the face of an additional +3.0C warming over the next 50 years, is nothing but hubris, careerism and/or pure misanthropy.
I think you are "signing to the choir." Everyone on this site....including me....thinks the risks are FAR GREATER to underestimating the impacts of global warming (as I previously stated).
What I think YOU....and Dr. Wadham's..... may NOT be thinking about....is the "ammunition" that is given to those in the "denier camp" and is USED by those in the denier camp when some of those predictions FALL SHORT.
I agree WHOLEHEARETEDLY with one of the guests in that podcast.....who said there is way too much attention to the "SHORT TERM" level of the Arctic ice sheet. And.....like yourself....I am MUCH MORE worried about the longer term effects (which for me....means only 10 years or more).
It is a "balancing act".....because the "politics" of the situation means that scientists.....and people who FOLLOW SCIENTISTS......need to be able to sway the "people in the middle"......and psychologists have told us that scaring them is NOT working. And promising things that don't come true....is looked at BY THEM as a scare tactic.
Just be aware that you....me.....and Dr. Wadhams', are all on the SAME SIDE....and have the same goals in mind. What needs to be done is to sway those "in the middle" to "see what is happening and will happen" so that they will do something as soon as possible.
I personally think we are NOW in the midst of the "next push up" in temperatures globally....and that will help to change some folk's mind. And I am talking about over the next 3-4 years.... We've already seen what has happened over just the last 3 years.