No apparent evidence that "trees could cease ..." (2015)
No apparent evidence that "trees could cease to be a carbon sink if we go past 2.5 degrees."
I don't think there's any evidence for the assertion that "trees could cease to be a carbon sink if we go past 2.5 degrees". Current process-based models generally project an ongoing carbon net land sink for all emissions scenarios http://www.climatechange2013.org/images/figures/WGI_AR5_Fig6-24.jpg –the uncertainties are large, but there's no indication of global forests switching from source to sink in association with a global warming threshold.  We might get increased mortality in some places, but linking a global shift in this to a specific global warming threshold isn't backed up by anything as far as I'm aware.  

Richard Betts.

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Global Warming and Climate Change (CEC) (SER) (GCC) »Global Warming and Climate Change (CEC) (SER) (GCC)
Impacts »Impacts
Plants »Plants
Tree Die-Off »Tree Die-Off
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Key role of forests "may be lost" (global) at 2.5C (2009) »Key role of forests "may be lost" (global) at 2.5C (2009)
No apparent evidence that "trees could cease ..." (2015)
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