C
A would decrease heat trapping and hence lower temp
B, actually depends where. Trees themselves can absorb more sunlight than snow or bright desert, but trap CO2 as they grwo.
D - as for A
Chiefwaz, I also weep for the future, but with better reason
With over 90% certainty, global warming is real, serious, unprecedented, driven mainly by human activity, and requires appropriate action.This conclusion is reached even after taking natural variation, such as that connected to the sunspot cycle, into account. See statement at
http://royalsociety.org/displaypagedoc.asp?id=20742
endorsed by the [US] National Academy of Sciences, Chinese Academy of Sciences, Indian National Science Academy, , Russian Academy of Sciences, Royal Society (London). Over 40 other academies of national stature have issued similar statements:
http://en.wikipedia.org/wiki/Scientific_opinion_on_climate_change#Academies_of_Science
(If links fail, cut, paste, and join up
http://royalsociety.org/
displaypagedoc.asp?id=20742
and
http://en.wikipedia.org/wiki/Scientific
_opinion_on_climate_change
#Academies_of_Science)
This view is based on thirty years of watching the evidence accumulate. Look in SCIENCE or NATURE, or even references in Wikipedia Global warming, for extensive real peer-reviewed scientific research.
See eg The Hot Topic, Dvd King, Prof. Cambridge (now Oxford); Global Warming 4th ed. 2009, John Houghton, Prof. AtmosphericSci., Oxford
See also the NSF report:
"Transitions and Tipping Points in Complex Environmental Systems"
through: http://www.nsf.gov/geo/ere/ereweb/advisory.cfm
There is a lot of disinformation out there, and a lot of fossil fuel money being spent to push it. All too successfully, to judge from YA