Tropics Feel the Heat of Climate Change

Researchers suspect tropical forests like this are more susceptible to changes in climate than they thought.

Tropical ecosystems may be responding to global warming more energetically than anyone had expected.

Scientists from China, Germany, France, the United Kingdom and the United States report in the journal Nature that the tropical carbon cycle – the uptake and release of carbon dioxide from and back into the atmosphere – has become twice as sensitive to temperature change in the last 50 years.

A one degree rise in average tropical temperature leads to a release of around two billion more tons of carbon per year from tropical forests and savannahs, compared with the 1960s and 1970s.

This is unexpected. Climate scientists had foreseen the ability of land-based ecosystems to store carbon declining through the coming century as average global temperatures rise, but not on this scale.

Positive feedback loop
To arrive at their conclusions, the researchers looked not at the crude rise in carbon dioxide levels in the atmosphere, but the year-to-year variations of traces of the gas recorded both at the top of the Mauna Loa volcano in Hawaii and at the South Pole, and then matched these with mean annual temperature variations over the same timescale.

Read  the full story here.

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About jensera

Jennifer Harrington is a Toronto-based illustrator, writer and graphic designer. She illustrated the best-selling children’s book series 'A Moose in a Maple Tree,' which includes the titles 'A Moose in a Maple Tree,' 'The Night Before a Canadian Christmas' and 'Canadian Jingle Bells.' She is also the owner of JSH Graphics, a boutique graphic design agency that specializes in print and web advertising. With her latest project, Eco Books 4 Kids, Jennifer has partnered with illustrator Michael Arnott to create a series of ecologically-themed ebooks for children. Her next book, 'Spirit Bear,' is due for release in the Summer of 2013. Jennifer offers two different school presentations for her 'Moose in a Maple Tree' collection, an illustration demonstration and a Christmas concert series, which can be booked at www.amooseinamapletree.com. She will be taking bookings for school readings of 'Spirit Bear' beginning in October 2013.

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