9/21: Romney releases 2011 tax return; cop with record number of complaints 9/20: Romney camp shifts tactics; biologist fights to restore coral reefs And, as Jan Crawford reports, that's prompting the Romney campaign to shift tactics; And, a new report says that climate change will damage 70 percent of the world's coral by 2030. Elaine Quijano speaks - underwater - with a marine biologist who has developed a way to save the coral.