Hurricane Katrina hit on New Orleans on 29 August 2005. Nowhere was the devastation greater than in the largely black Ninth Ward.
NOAA says tropical storm Erika will continue to batter the Caribbean with 10 inches of rain in Dominican Republic.
12 people have been killed in Dominica by the storm which is headed across the Atlantic.
A large breakout of lava from a volcano on Hawaii's Big Island has flowed into the surrounding forest.
Judging from these photos, wet weather won't put a damper on the spirits of Carnival revellers.
Scientists say the world is "locked in" on a 3ft (1m) sea level rise, driven by climate change.
Once-a-century giant wave would threaten 130 million people living on the coast.
Survey shows Americans' low awareness of Pope's position on global warming.
The weaker of two cubs, born to giant panda Mei Xiang on Saturday, has died.
University of Haifa academic wants to set up a global natural species conservation organisation.
Piton de la Fournaise volcano on has Reunion Island erupted, spewing lava.
The 'new' whiter New Orleans is booming, while black areas are abandoned.
CGD report finds pattern of deforestation 'more dire' than previously thought.
Falling water levels uncover remains of Second World War Russian plane in Kamion.
Mini-trackers have been glued to the back of 10,000 bees to model their activity.