So apparently there are the normal Greens (Estonian Greens), and Richness of Life which is another Green party? I don't understand why Richness of Life exists, they'll probably just stop the regular Greens from breaking the threshold...
They exist because their leader (Artur Talvik; he led the Free Party list at the last election despite not being a party member, then he joined and became leader, and then he resigned to form his own party: which is entirely typical for the region - as is him not standing as the parties PM candidate for some reason) wanted his own political force and for no other reason. The region historically has had a lot of these sort of parties (weird vague populist centrist parties who stand for nice sounding things like direct democracy or anti-corruption: and then inevitably die when it turns out they don't practice what they preach) and I'd less look at their stated ideology and more where their leaders came from.
From what I can gather they aren't polling well at all so they may well not get anywhere close - the voting system in Estonia lets people vote for candidates and if an individual candidate gets enough votes to win a seat then they get in despite thresholds: and since Talvik is their only candidate of note he might just get in by himself.