Sedum is a genus of plants of the family Crassulaceae. These hardy, succulent plants are preferable to grass on green roofs because they absorb and retain water, reducing runoff and the need for watering.

Sky glow is caused by stray light from unshielded light sources and light reflecting off surfaces that then enter the atmosphere and illuminate and reflect off dust, debris, and water vapor. Sky glow can substantially limit observation of the night sky, compromise astronomical research, and adversely affect nocturnal environments.

Slag is a by-product of smelting ore to purify metals, often used in concrete and to improve durability. Using slag both makes use of a byproduct and reduces the need for other materials in cement.

Solar panels can refer to either photovoltaic systems (see above), which produce electricity from sunlight, or solar hot water systems, which heat water directly with sunlight. In a solar hot water system, water or antifreeze is circulated through a closed loop system and preheats a tank of water.

Stormwater is water that accumulates during precipitation rather than soaking into the ground.

Stormwater detention systems regulate and control runoff by slowing the rate of discharge to reduce impacts downstream. Stormwater retention systems store water indefinitely, until it is lost through percolation, evaporation, or is taken up by plants.

Stormwater runoff is a cause of pollution; water running off of impervious surfaces (see above) accumulates pollutants (such as gasoline, fertilizers, pesticides, etc.) and brings them into water bodies. Stormwater runoff also erodes soil and waterways. Pervious surfaces (see above), stormwater detention systems (see below), or rainwater catchment systems (see above) reduce stormwater runoff.