Polar bears depend on sea ice.
Heather Wallace -LRB- born December 4 , 1961 in Kitwe , Zambia -RRB- is a former professional female squash player who represented Scotland and Canada during her career .. Kitwe. Kitwe. Zambia. Zambia. squash. squash ( sport ). Scotland. Scotland. Canada. Canada. She reached a career-high world ranking of World No. 6 in July 1993 .. She represented Scotland during 1981 Women 's World Team Squash Championships .. Squash. Squash ( sport ). Scotland. Scotland