These findings could lead to a better understanding of the impact of smoking on the immunity of both healthy people and those with various diseases or medical conditions. They also demonstrate the importance of quitting smoking as soon as possible
Stress from deforestation, drought, fire and rising temperatures have eroded the ability of the Amazon's forests to withstand shocks, with scientists warning this could trigger a so-called "tipping point"
The "cidade maravilhosa," or wonderful city of Rio, on Friday officially inaugurated its emblematic festival, becoming the scene of countless street parties, the traditional "blocos" that can draw hundreds of thousands of people
The first-ever State of the World's Migratory Species assessment, which focuses on the 1,189 species covered by the UN Convention on the Conservation of Migratory Species of Wild Animals (CMS), found that one in five is threatened with extinction and 44 percent are seeing their populations decline