Comments policy

Stay on-topic: stick to the subject of the post you are commenting on. Off-topic comments (even if reasonable, polite and interesting) may be deleted. Comments that contain links to inappropriate, irrelevant or commercial sites may also be deleted.

Be polite: comments which contain swearing or which abuse others may be deleted. No personal attacks or accusations.

Advance the discussion: we welcome evidence-based comments and links to useful resources. Persistent comments along the lines of “this is just alarmist/denier nonsense” with no supporting evidence may be deleted.