EVERGLADES, FL - MAY 28: United States Senator Bill Nelson (D-FL), United States Secretary of the Interior Ken Salazar and Florida Governor Charlie Crist (L-R) tour the Florida Everglades on an airboat  on May 28, 2009 in the Everglades, Florida. Thomas Strickland, United States Interior Assistant Secretary for Fish and Wildlife and Parks is also on the airboat (far left rear). Salazar visited the Everglades to get a first hand look at the park and get a briefing on invasive species. Getty Images logo Getty Images 5 months ago

EVERGLADES, FL - MAY 28: United States Senator Bill Nelson (D-FL), United States Secretary of the Interior Ken Salazar and Florida Governor Charlie Crist (L-R) tour the Florida Everglades on an airboat on May 28, 2009 in the Everglades, Florida. Thomas Strickland, United States Interior Assistant Secretary for Fish and Wildlife and Parks is also on the airboat (far left rear). Salazar visited the Everglades to get a first hand look at the park and get a briefing on invasive species.