claim: “Although the extent of the summer sea ice after 2006 dropped abruptly to levels not expected until 2050, the predicted 67-per-cent decline in polar bear numbers simply didn’t happen.
evidences.evidence_id: Polar bear:357
evidences.article: Polar bear
evidences.evidence: Rising temperatures cause the sea ice to melt earlier in the year, driving the bears to shore before they have built sufficient fat reserves to survive the period of scarce food in the late summer and early fall.
evidences.votes: REFUTES REFUTES
evidences.evidence_id: Polar bear:374
evidences.article: Polar bear
evidences.evidence: Between 1987 and 2004, the Western Hudson Bay population declined by 22%, although the population was listed as "stable" as of 2017.
evidences.votes: SUPPORTS NOT_ENOUGH_INFO
evidences.evidence_id: Polar bear:377
evidences.article: Polar bear
evidences.evidence: The proportion of maternity dens on sea ice has changed from 62% between the years 1985 through 1994, to 37% over the years 1998 through 2004.
evidences.votes: NOT_ENOUGH_INFO NOT_ENOUGH_INFO
evidences.evidence_id: Polar bear:397
evidences.article: Polar bear
evidences.evidence: Steven Amstrup and other U.S. Geological Survey scientists have predicted two-thirds of the world's polar bears may disappear by 2050, based on moderate projections for the shrinking of summer sea ice caused by climate change, though the validity of this study has been debated.
evidences.votes: SUPPORTS SUPPORTS
evidences.evidence_id: Polar bear:404
evidences.article: Polar bear
evidences.evidence: Warnings about the future of the polar bear are often contrasted with the fact that worldwide population estimates have increased over the past 50 years and are relatively stable today.
evidences.votes: SUPPORTS NOT_ENOUGH_INFO