Preferred roof/car/house paint colour after reading last part ?
Green? Lets grow moss/grass/ferns on our roofs...?
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To expansive to implement and giving more heat emission compared to chose white painted roof.
We can use also high reflection materials.
Mylar 90 – 98 %
Foylon 92 - 95 %
BW poly 85 - 90 %
Flat white paint 60 - 90 %
Mirror 82 - 87 %
Glossy white paint 70 - 80 %
Aluminium foil (flat side) 50 - 70 %
Black paint < 10 %
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I'm in a tree hating country, if only we could get them to stop chopping.
Even people that don't need wood fires have one because a home needs one, fools, same with a garage, waste of space for their holy cow.
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I think it was LA where the mayor decided to spend money on repaving the roads with brighter colored paving, which according to calculations would lower the city's temperature by a few degrees at least.
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Haven't you posted this already, or have i gone back in time?
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This has already been implemented in couple of countries at least a couple years now
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This is not the cause nor the solution to global climate change.
LA and other cities are experimenting with paint and pavement color to alleviate local heat - not a contributor to global temp.
Global temp is all about carbon emissions. Why? Because with too many emissions, heat is trapped in atmosphere. Otherwise, it dissipates.
Get it? Heat dissipates out of the atmosphere. Unless we throw so much carbon emissions into the atmosphere that we trap the heat.
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I do not dismissed CO2 contribution as insulation but, amount of heat dissipatet by atmosphere have its limits and, by changing earth surface wee adding more heat to deal with.
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Incorrect.
Amount of heat dissipated is limited by CO2 emissions primarily. Otherwise, can dissipate all the heat.
By changing earth surface by painting surfaces in cities, we are not changing heat appreciably.
By favoring trees over crops, we are not impacting global climate change by means of temperature.
Power consumption by cities contributes to global climate change by burning fossil fuels which cause carbon emissions which trap heat. Reducing power consumption is not very feasible. Reducing reliance on fossil fuels is feasible - even though there are current obstacles.
More trees in cities makes living in cities more bearable. Less heat radiated by pavement in cities would make living in cities more bearable. But, neither contributes to the lessening of global climate change.
And your reddit threads don't get much traction, etiher, do they? Even in subreddits populated by climate change wackos.
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Lets look on Contribution to greenhouse effect
H20 vapour 36–72% - we cannot reduce this
CO2 contribution 9–26%
Methane 4-9% - we can reduce this but in cost a meat production ;)
Ozone 3-7% - we really need this one to protect from as from UV
Simply C02 is not main drive of greenhouse effect
Greenhouse gases absorb infra-red light, visible light pass freely through it, by painting white we reduce how much heat we absorb from sunlight and this will reduce how much infra-red light we emit that later will be absorber and re-emit by greenhouses.
Simpleexample: Black painted surface deflect 5% light in visible range 95% is converted to heat.
White painted surface deflected 80% of light in visible range and only 20% is converted to heat. its 4,75 time less compared to black one.
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CO2 is the main drive of greenhouse effect that we have control over. That is what your own list says.
How much surface of the earth are we talking here? 1%? So if we reduce the visible-light-converted-to-heat by 4.75 times for 1% of the earh's surface, then how much have we affected global climate? You don't have any numbers at all about how surface absorption of light contributes to global temp. None.
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Urban are is 1,45% earth surface , crops plants *deforestation 10%+.
Earth surface receives 89 PW energy from sun per day is 2 136PWh , from earlier calculation on deforestation . increasing crop area we converted 26 PWh per day more energy to heat compared before remove forest and this is 1,2% more heat to deal with.
Lets assume that urban area convert 73.2% light to heat that give as addition 7,54 PWh per day from our tiny 1,45%
for total 33,54 PWh - 1,57% more heat to deal with.
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You have not given us any alternative to growing crops for food. So the only change you are proposing is to paint things in cities white. Which by your own math is a miniscule amount. And your own math and numbers are not precise enough to measure such small percentages. Your numbers are within your margin of error.
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We can always decrease crop area by 2x if we limit eating meat, not even counting benefit to decrease greenhouses. * I personally like meat but our government can always at extra tax on meat like 1000%, and this same changing our eating habits or start Revolution ;)
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Well, you are still making up numbers and you haven't offered any support for your idea that taxation will work the way you say it will. And you aren't anwering questions and objections to the miniscule change, if any, that your idea would effect.
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Any system keep in equilibrium can be destabilized by even small change.
Greenhouses gas increase insulation level, our change to earth surface increase amount of heat.
And ask one question how much our emission CO2 contribute to greenhouse effect at curent 400ppm natural is around 300ppm
our contribution is from 3 - 8,6% now my number 1,45% is not minuscule
Greenhouse effect is in range 150-300W m2
let calculate highest option 8,6% x 300Wm2 = 25,8Wm2
25,8Wm2 x 24h x earth surface = 315,83 PWh per day my previous calculations about earth surface changes show 33,54 PWh per day.
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Just put a giant umbrella, because obviously earth is flat, duh
I'll be waiting my Nobel Prize.... An eternity
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Too many people don't believe it. Don't care or are actively paying to subdue it because that's how they make money. We are doomed as humans. We are too selfish.
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Making sidewalksand roofs from white material, adding trees to cities will helps. Add heavy tax for building house with black roof will also help and add tax reduction if roof is white high reflective
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Solar Panels are whats on the south side of my roof.
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What you want is housing that absorbs light (aka heat) in winter and reflects it in summer, so we're burning less fossil fuels running our heating and air conditioning units. Drive your car less, plant trees, encourage recycling, and support "green" companies and organizations. Switch to solar power for homes, and build solar/wind farms where possible.
One problem we have here (the USA) is an administration that doesn't believe in (man-made) global warming. sigh That, and there's still way too much money being made in fossil fuels.
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He if funny guy he will be great for comedy only one scary thing about him that he is President of USA.
I almost sure that he invited Putin to White house and prepared banana skin trap for him to slip and fall from steers. 😆
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Indeed, he makes me laugh and weep at the same time. ;_;
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With global warming rampant it's not a bad idea to drink to drink a minimum of 6 liters of water per day and add a liter per hour under adverse conditions, like the IDF does. ;-)
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My thoughts +calculation on data that I found on internet, my calculation can be wrong by base idea is still valid.
Contribution for climate change
Cutting forest to have area to grown crops, and urban is important factor of climate change, and more extreme weather.
Forest 18% Light deflected 28.2% (sunlight energy collected by chlorophyll) =46,8% rest 53,2% is heat.
Crop Plants 63.2% is heat.
Agricultural land (% of land area) in 1990 reach 39,5% lets assume only 35% is converted from forest
We have 10% more heat converted from sun light per area, now 35% of Land
3.5–7.0kW * daily sun energy per square meter let use 5kw
52 129 000 000 000m2 x 5kW x10% = 26 064,5 TW more heat per each day How much is it a lot lets compare to how much energy we generated in 2015 = 168 519 TW per day 473 TW our change to forest generate 55,1 more energy heat that our entire technical civilization produce.
Contribution for extreme weather
Forest decrease daily temperature variation, compare to plain area less variation more stable weather.
For rainforest temperature is almost constant for day / night cycle and is 26C, and we replace it wit crops where temperature variation is significant.
Higher temperate variation case strong winds and contribute toward stronger Hurricanes.
Urban area is 5% of land area lets look how simply paint colour can contribute.
Full version on reddit
https://www.reddit.com/r/climatechange/comments/907d97/change_of_earth_surface_and_its_contribution_for/
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