The bear was later killed after injuring the French tourist.
Shrinking sea ice caused by a warming climate is forcing bears to stay inland in search of food, conservationists say.
A French swimming competition, an impressive sandcastle and a displaced polar bear round out this week's best images.
"People are scared. They are frightened to leave homes, and their daily routines are broken."
The injuries aren't life-threatening for the man who was taking passengers to shore for a tour.
Mysterious, powerful, dangerous and stunningly beautiful, the polar bear, currently in danger of extinction due to climate change, evokes fascination and awe. They are one of the most iconic and legendary animals to grace this planet.
Captivating video shows the 5-week-old stretching out and making cute noises.