Ms Lucas, who had two spells as chief of her celebration, stated her position in Parliament meant she had “struggled to spend the time I would like” on the crises going through the atmosphere.
“I’ve subsequently determined to not stand once more as your MP on the subsequent election,” she instructed constituents in a letter.
The 62-year-old was elected because the MP for Brighton Pavilion on the 2010 common election, changing into the primary Inexperienced Social gathering candidate to be elected to the Home of Commons.
Her majority has elevated on the subsequent three elections, with voters returning her to Parliament with a majority of just about 20,000 in 2019.
In feedback first reported by The Argus newspaper in Brighton, Ms Lucas stated it had been the “privilege of my life to serve this extraordinary constituency and group”.
However she stated her deal with being “before everything a great constituency MP” meant she had “not been capable of focus as a lot as I would love” on local weather considerations.
She stated: “I’ve carried out all the pieces attainable to assist wherever I can and all the time labored to make sure that folks really feel heard, that their considerations matter, and that they don’t seem to be alone.
“However the depth of those constituency commitments, along with the actual tasks of being my celebration’s sole MP, imply that, paradoxically, I’ve not been capable of focus as a lot as I would love on the existential challenges that drive me – the character and local weather emergencies.
“I’ve all the time been a special sort of politician – as those that witnessed my arrest, court docket case and acquittal over peaceable protest on the fracking web site in Balcombe almost 10 years in the past will recall.
“And the reality is, as these threats to our treasured planet change into ever extra pressing, I’ve struggled to spend the time I would like on these accelerating crises.
“I’ve subsequently determined to not stand once more as your MP on the subsequent election.”
Ms Lucas was Inexperienced Social gathering chief between 2008 and 2012 earlier than returning for a second stint on the helm, this time co-leading the celebration with Jonathan Bartley for 2 years from September 2016.
She joins a rising band of senior elected politicians who’ve declared that they are going to step down on the subsequent election, which is predicted to be contested subsequent yr.