From Wikipedia it feels like maybe the court placed a guard on site to *prevent* IGR from collecting anything from the premises (there was an ongoing dispute on the property)

> The fate of the abandoned site was disputed in court between IGR and the Society of Saint Vincent de Paul, then owner of the premises

My understanding is that this is how the court got involved, not because of any radioactive materials; IGR owner tried to make the court aware & let him retrieve the radioactive materials but had no luck.

It is admittedly unclear if the guard was posted to protect the radioactive materials or just the building in general. However, do note that guard is also not one of the named defendants (if it was his responsibility specifically to protect the capsule, I argue that he failed big time and should've been prosecuted for it; if he was just told "guard the building", it's a different issue in my mind).

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[edit] Also it seems that IGR were _forced_ to leave the caesium behind, in the first place: https://news.ycombinator.com/item?id=29148480

> If the problem with air travel is emissions then we ought to work on alternative fuels.

They don't exist yet.

> Globally, air travel accounts for only a small proportion of emissions

Air travel is 2% of all global emissions. This is huge for such a small sector.

> Before Deliveroo (and similar services) restaurants did not offer delivery at all.

This is far from universally true, especially Asian takeaways typically hired their own driver, but the practice was also commonplace for many actual restaurants too