What is usually missing from estimates of coal reserves is a rigorous appreciation of how changes in economics (both prices and costs) and technology could affect reserve estimates. (rstb.royalsocietypublishing.org)
First of all, coal reserves in the two areas that provide over 70 % of the nation's coal.... (blogs.wvgazettemail.com)
If current coal reserves are burned on a time scale short compared to time scales for carbon storage, then CO2 concentrations will go over 400 ppm rather easily. (realclimate.org)