Australia's rainforests are releasing more carbon than they absorb, warn scientists

Australia's tropical rainforests have become the first in the world to release more carbon than they absorb, in a trend linked to climate change, a study has found. Rainforests are usually regarded as so-called "carbon sinks" as they absorb more emissions than they emit with new trees offsetting the carbon released by dead ones.But a study looking at data from Queensland forests found that extreme temperatures…