President Obama and his counterparts from Canada and Mexico will meet at summit . Carter Roberts , Omar Vidal : They should discuss plight of monarch butterflies . 2013 was the worst year for these butterflies in recorded history , they say . Roberts , Vidal : The U.S. is not doing enough to protect them.
President Obama and his counterparts from Canada and Mexico will meet at summit . Carter Roberts , Omar Vidal : They should discuss plight of monarch butterflies . 2013 was the worst year for these butterflies in recorded history , they say . Roberts , Vidal : They 're a special to North America , we must stop their decline .