Think about it, vegetated surfaces will create chemical energy from sunlight through photosynthesis. unvegetated surface (concrete, pavement or bare soil alike) will turn the sun's energy in to warmth/heat*. We all know how significant this can influence microclimate by experience, several degrees in temperature from a well vegetated area to a bare soil or concrete area.
toan tr wrote:OP, actually, on the net basis of the planet, i suspect the contrary. Concrete, metals, and glass tend to have a higher reflectivity than plants or dirt. furthermore, if you hold your hand above a concrete slab on a sunny day, the heat you feel is heat radiated away from the planet. i think the difference can't be more than a percent or two.
i did a quick check and google says 3% of earth is urban areas. looking around, i'd say at most 10% of that is buildings and roads so we are talking about 0.3% of 2% (0.006%) maybe.
toan tr wrote:the heat is not really heat, it's radiation, so it's more energy than heat. and it goes into space.
heat comes from the sun, mostly in the form or radiation (in this case sunlight)............
The carbon dioxide level in the atmosphere was about 285 parts per million in 1880, when the GISS global temperature record begins. By 1960, the average concentration had risen to about 315 parts per million. Today it exceeds 390 parts per million and continues to rise at an accelerating pace.
branimir marold wrote:where is heat "reflected"?
from where it comes in the first place? (heat)
I thought space is cold
now I'm quite serious about this question cause I'm not sure I get some facts right, if you can answer would appreciated!