However, models do not agree on the direction of near - term changes across more than 50 percent of terrestrial lands, highlighting major uncertainties in the next few decades. (dotearth.blogs.nytimes.com)
At the time, two major uncertainties plagued climate science: how much of the CO2 in the air came from fossil fuels as opposed to deforestation? (insideclimatenews.org)
«I think there's still major uncertainty about the size of the future sink,» Lewis says. (sciencemag.org)