FAO says climate change main challenge to meeting food needs as world population grows

Climate change is expected to be one of the main obstacles to feeding the world population, which is probably to top 10 billion by mid-century, according to a report on Wednesday from the United Nations Food and Agriculture Organization (FAO).

Half of Amazonian tree species threatened (study)

About half of all tree species in the Amazon, the world's most diverse forest, may be at risk for extinction, according to a new study published Friday.