ScienceDaily: As the world prepares for the UN climate talks in Paris later this month, researchers warn that there's no time to waste in shifting to renewable energy sources if we are to avoid dangerous climate change. That's especially true when it comes to bioenergy, which causes a temporary increase in CO2 levels that is later removed as replacement biostocks grow. When it comes to limiting global temperature increases from greenhouse gas emissions, timing is everything -- even when it comes to "climate friendly"...