Which statement below is TRUE about the impact of Urban Greenspaces on the environment?

How big should urban green spaces be? | Ensia

a
Increased vegetation causes reduced air pollution/ more oxygen
b
Increased temperatures in big cities due to more CO2 gasses in the air
c
Less vegetation/ground cover causes erosion
d
Use of land is wasteful to the environment and unnecessary.

a

Increased vegetation causes reduced air pollution/ more oxygen