I'm not an expert, and the paper includes lots of hand - wavy calculations for total amounts of CO2 and CH4 released through rice - farming and deforestation - reforestation — but I find it hard to beleive that the amounts are so trivial as to be negligible
for climate purposes.
[Response: For
climate purposes, the problem is coal (and maybe methane hydrates)-- there is more than enough fossil fuel reserves for the IPCC scenarios.
More importantly for
climate purposes, the longer term US averages have not changed rank.
[Response: Let's imagine how much water vapour we can be losing to space for it to be an important number for
climate purposes: For instance, let's imagine it is as important as the geothermal heat flux (itself too small to pay much attention to): 0.075 W / m2.
However it seems to me that for
climate purposes a major application of boreholes is in exploring 18th century and earlier climates.
Generally, for
climate purpose, the Earth's temperature is regarded as the average temperature of the air at any given moment and much scientific effort has been put into ascertaining what it is and how the real world arrives at that temperature for the air.
A tipping «element» for
climate purposes is defined as