Those two can’t really be compared. Ozone is likely more relevant to humans on the whole (less skin cancer ).
My main issue with this study is that it’s based on public sightings (no I don’t know how else they would do it). During the height of whaling when they were hunted for oil they would have changed behaviors to avoid public sightings. Is it possible this rebound was not a rebound in their total numbers but just them not being terrified to go near human activity anymore since the decline of whaling? Whales live for a long time. In the 50s there could have been whales living that survived the peak of human whaling activity.
Those two can’t really be compared. Ozone is likely more relevant to humans on the whole (less skin cancer ).
My main issue with this study is that it’s based on public sightings (no I don’t know how else they would do it). During the height of whaling when they were hunted for oil they would have changed behaviors to avoid public sightings. Is it possible this rebound was not a rebound in their total numbers but just them not being terrified to go near human activity anymore since the decline of whaling? Whales live for a long time. In the 50s there could have been whales living that survived the peak of human whaling activity.
Disclaimer: I don’t actually know anything.