At the very least the variation of outgoing IR on a month to month basis is huge compared with the small linear decrease that the CO2 increase should generate. (wattsupwiththat.com)
Pediatric neuroimaging studies, up to now exclusively cross sectional, identify linear decreases in cortical gray matter and increases in white matter across ages 4 to 20. (semanticscholar.org)
Children's mean growth curve evidenced a significant linear decrease in cortisol values from baseline to 20 min post-stress and a leveling off by 40 min post-stress. (link.springer.com)