fringe 

Alun wrote: 

 "far too much and far too pov"

if POV means not NPOV, i challenge you to identify text which isn't presented neutrally (i.e. not favoring a side but neutrally stating other people's opinions). then lets improve that text.

 "fringe theories shoud not have so much space"

per NPOV: All Wikipedia articles and other encyclopedic content must be written from a neutral point of view, representing significant views fairly, proportionately, and without bias.

a view that is mentioned in almost every discussion of the topic should be described fairly and in proportion to the attention it receives.

 "the addition was entirely promoting a singe point of view"

a view that was not previously missing from the article

 "provide arguments against as well, or it's pov-pushing"

the "4.3 Environmental impacts" section does just that, but if there are specific points that should be added or changed, i encourage further targeted development. demanding perfection in every edit seems inappropriate.