Washington Post: Adam Fier recently sold his home, got rid of his car and pulled his twin 6-year-old girls out of elementary school in Montgomery County. He and his wife packed the family’s belongings and moved to New Zealand — a place they had never visited or seen before, and where they have no family or professional connections. Among the top reasons: global warming. Halfway around the world, the president of Kiribati, a Pacific nation of low-lying islands, said last week that his country is …