5% of the worlds CO2 emissions is from the use of concrete.
https://en.wikipedia.org/wiki/Environmental_impact_of_concrete
Not only that,.
Urban heat
Both concrete and
asphalt are the primary contributors to what is known as the
urban heat island effect.
Using light-colored concrete has proven effective in reflecting up to 50% more light than asphalt and reducing ambient temperature.
[2] A low
albedo value, characteristic of black asphalt, absorbs a large percentage of solar heat and contributes to the warming of cities. By paving with light colored concrete, in addition to replacing asphalt with light-colored concrete, communities can lower their average temperature.
[23]
In many U.S. cities, pavement covers about 30–40% of the surface area.
[2] This directly affects the temperature of the city and contributes to the
urban heat island effect. Paving with light-colored concrete would lower temperatures of paved areas and improve night-time visibility.
[2] The potential of energy saving within an area is also high. With lower temperatures, the demand for air conditioning theoretically decreases, saving energy. However, research into the interaction between reflective pavements and buildings has found that, unless the nearby buildings are fitted with reflective glass, solar radiation reflected off pavements can increase building temperatures, increasing air conditioning demands.
[24]
Atlanta has tried to mitigate the heat-island effect. City officials noted that when using heat-reflecting concrete, their average city temperature decreased by 6 °F (3.3 °C).
[25] The Design Trust for Public Space found that by slightly raising the albedo value in New York City, beneficial effects such as energy savings could be achieved.[
citation needed] It was concluded that this could be accomplished by the replacement of black asphalt with light-colored concrete.
However, in winter this may be a disadvantage as ice will form more easily and remain longer on the light colored surfaces as they will be colder due to less energy absorbed from the reduced amount of sunlight in winter.[23]
Just can't win can we.