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Methane emissions by source. Credit: Global Carbon Project of Future Earth

Global concentrations of methane, a powerful greenhouse gas and cause of climate change, are now growing faster in the atmosphere than at any other time in the past two decades.

That is the message of a team of international scientists in an editorial to be published 12 December in the journal Environmental Research Letters. The group reports that methane concentrations in the air began to surge around 2007 and grew precipitously in 2014 and 2015. In that two-year period, concentrations shot up by 10 or more parts per billion annually. It's a stark contrast from the early 2000s when methane concentrations crept up by just 0.5 parts per billion on average each year. The reason for the spike is unclear but may come from emissions from agricultural sources and mainly around the tropics - potentially from farm sites like  and cattle pastures.

Read more: Surge in methane emissions threatens efforts to slow climate change

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LONDON, 18 December, 2016 - As a famous old song says, they've got an awful lot of coffee in Brazil. But if the findings of an Australian research institute are right, that will change over the next 30 years.

Read more: Coffee belt feels climate squeeze

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Fresh, bold innovation in thinking and business operations can open the door to faster, more effective climate change action, said panellsts at this year's Responsible Business Forum on Sustainable Development.

Discarded fishing nets have been used by a number of companies as raw material to manufacture their products, such as carpet tiles. Rethinking conventional business operations can help businesses take action on climate change. Image: Bernard Spragg. NZ, CC0 1.0

Fresh, bold innovation in thinking and business operations can open the door to faster, more effective climate change action, said panelists at this year's Responsible Business Forum on Sustainable Development.

Read more: Disrupt your business model to take action on climate change

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