The energy required to operate and maintain the dam is often equal to the energy produced by the dam.

Dams often change the current and width of a watershed, altering the riparian ecosystem.

Many fish populations (including salmon and trout) are decimated because dams restrict access to essential habitat.

Dams can contribute to flooding and resulting property damage.

Animals that rely on fish as sustainance may begin to decline because the dam has permanently altered fish habitat.

Honey badger

Giraffe

Aardvark

Gerenuk

75 years

50 years

25 years

600 years

100 years

Parallelism

Interspecific competition

Predation

Parasitism

Mutualism

Hydrogen has a low energy density by weight.

Hydrogen has a low energy density by volume.

Hydrogen is very challenging and dangerous to transport.

The input of energy to produce hydrogen is often greater than the energy of the resulting hydrogen.

Existing infrastructure for manufacturing and transporting hydrogen is minimal to nonexistent.

The phosphorus cycle

The sulfur cycle

The nitrogen cycle

The carbon cycle

A population in which the number of children is approximately the same as the number of reproducing adults

A population in which carrying capacity is well above the current number of individuals

A population that uses resources in an effective manner, such as resource partitioning

A population in which the offspring have a low mortality rate

A population in which member numbers do not fluctuate in a given time period

Niche

Habituation

Biome

Community

TerritorialityTerr

The phosphorus cycle

The sulfur cycle

The nitrogen cycle

The carbon cycle

Parallelism

Interspecific competition

Predation

Parasitism

Mutualism