It is not possible to predict with complete accuracy what the ecological consequences will be.

BBC: Should genetic engineering be stopped?

Difficult, also, will be establishing the precise ecological consequences of the modified behaviours.

BBC: Drug residues 'alter fish behaviour'

The potential side effects of geoengineering are presently not well understood and will likely include unintended ecological consequences, which in turn can pose important political, social, and ethical challenges.

UNESCO: MEDIA SERVICES