Some types of concrete are better for the environment that others. For example, pervious or permeable concrete is more porous and so allows water to penetrate through. This reduces the risk of flooding from heavy rain and lets the water infiltrate the ground beneath for trees and plants to access. Also, some of the aggregates in concrete can come from recycled sources, such as rubble from demolitions, reducing the use of raw materials.
Although concrete sometimes has a bad reputation on the eco front, the strength, durability and longevity of concrete means it will very rarely need replacing or upgrading so its manufacture and production has a lower impact than some other materials.