please see here why taking thousand of different types of measurements and turning them into a single trend is dubious at best
it's about measurement , significant figures, and what you can rightfully claim.
http://www.purplemath.com/modules/rounding.htm
We want to put carbon back into the ground to build soil (humus) to feed the microbes and crawlies
humus also holds water which prevents runoff
soil with humus allow plants to grow
and as the post above describes, hydrated soil and plants
influence the small water cycle
which affects local climate