1 00:00:00,010 --> 00:00:04,080 2017 was the second hottest year since 1880, when global measurements first became possible. 2 00:00:12,100 --> 00:00:16,100 This continues a decades-long trend of global warming. 3 00:00:20,120 --> 00:00:24,140 As the global climate continues to warm, polar ice melts, 4 00:00:24,140 --> 00:00:28,160 sea levels rise, and fire seasons burn hotter and longer.