United Press International: The new head of U.S. intelligence and top adviser to President Barack Obama says climate change is a top threat to the national security of the country. Poor countries, often with weaker governance systems, also will be hit hardest by the extreme flooding or dry spells forced by significant warming of the planet, undermining leadership there and putting at-risk citizens further in harm’s way, warns Director of National Intelligence Adm. Dennis Blair. “The impacts (of climate …