Paragraph 1
For
, volcanologists have been predicting when volcanoes will erupt. Forecasting when a volcano might blow has been
unreliable. However, a study from NASA
and the Smithsonian Institution say they are a
closer to providing more accurate
. They used images from space to detect
in the colour of
near volcanoes. The study showed that an increase in carbon dioxide levels emitted by two
volcanoes in Costa Rica had an
on the colour of foliage. Trees in the
areas became greener.