We offer preliminary estimates of the lands unlikely to support new waves of climate refugees due to the residues of war, exhausted natural resources, declining net primary productivity, desertification, urban sprawl, land concentration, «paving the planet» with roads and greenhouse gas storage zones offsetting permafrost melt,» Geisler said. (sciencedaily.com)
Briffa: Also there is much published evidence for Europe (and France in particular) of increasing net primary productivity in natural and managed woodlands that may be associated either with nitrogen or increasing CO2 or both. (notrickszone.com)
The simulations suggested that the indirect effects of increased CO2 on net primary productivity (how much carbon dioxide vegetation takes in during photosynthesis minus how much carbon dioxide the plants release during respiration) are large and variable, ranging from less than 10 per cent to more than 100 per cent of the size of direct effects. (sciencedaily.com)