It has slides that just cover straightforward calculations that can be used for mental arithmetic practice and others that require a problem solving approach. (tes.com)
A rather straightforward calculation showed that doubling the level of carbon dioxide in the atmosphere... which would arrive in the late 21st century if no steps were taken to curb emissions... should raise the temperature of the surface roughly one degree C. However, a warmer atmosphere would hold more water vapor, which ought to cause another degree or so of warming. (scientificamerican.com)
I will begin by explaining Headline B since it is probably the most straightforward calculation of the three. (patricktbrown.org)