Global Energy Budget - Feedback

http://en.wikipedia.org/wiki/Earth%27s_energy_budget#Incoming_power

Perhaps the best site I have found yet that supports Climate Change theory.

Basically says solar radiation is by far the dominant energy source,

and that changes in albedo have been more significant than changes in solar radiation, and that the Earth's albedo has been siginificantly changed by changes in land use and the burning of fossil fuels.

I am still a little fuzzy on the effects of carbon dioxide levels on humidity.

I am guessing that global warming increases humidity and humidity increases global warming. Yes? So it is essentially another positive feedback. Are we running out of negative feedback? My guess is that plants would normally grow more during an interglacial period but we have not let them, so we need to be planting trees like mad and letting them grow and not remove so much biomass from the forests but let it rot. Yes? Too late? No?