In 2013, a lot of people were shocked by a news photo of a dead polar bear that     1     (find) on Norway’s Arctic island of Svalbard, far from its habitat. All that remained of the poor bear were “skin and bones”. Experts claimed that low sea ice levels     2     (cause) by climate change meant the bear could not hunt seals as before, so it had to travel greater distances in order to find food. This     3     (alarm) case showed how the increase in temperature had an impact on Earth’s ecology.