Noble (I really admire your excellent work on bringing injustices in education to people's attention here on MN, btw!), I don't think they're a sideshow at all. Nor a distraction.
De-carbonisation is a multifaceted problem which is being tackled on many fronts. As I'm sure you know, climate activists have been plugging away for close to half a century trying to raise awareness of the dangers of unchecked carbon emissions. For decades, it was considered a niche area of scientific research with scant funding and portrayed by the fossil fuel lobby as irrelevant and crankish (similar to the efforts of tobacco companies to discredit medical research linking smoking to cancer and respiratory poor health).
The public may have been aware of the growing threat posed by 'global warming' but not necessarily believed there was much point in trying to do anything about it, so happy to defer to 'scientists working on it behind the scenes'.
In the spring of 2019, XR and Fridays for Future with Greta Thunberg jointly created a new space in the public and media awareness for climate activism through civil disobedience, a key part of which relied on disruption to the judiciary. The Overton Window was shifted, climate emergency was declared by the UK government and across local authorities up and down the country who crafted carbon policies to reflect this, corporations became visibly pro-active about their carbon policies (even if, as some employees on MN emphatically state, this pre-dates any climate activist pressure), global insurance companies became transparent about policies pertaining to sea-level rise and anticipated logistical issues arising from resource-scarcity as a result of a changing climate.
These are just some of the changes which I believe were brought about by the increased visibility of climate activism through civil disobedience. Of course, the climate scientists were always working away behind the scenes and, crucially, trying to raise the alarm, but just didn't have a big enough platform. Now, with collective attention firmly fixed on the climate emergency and the wide acknowledgement that a transition to renewables is necessary if multi-billion dollar losses are to be avoided, not to mention human life and biodiversity, there is ample funding for new science and technology, as big financial gains are ripe for (not so) early adaptors.