I think with Labour having lurched quite far to the left, they are essentially a remain version of Labour but a bit more radical environmentally; but with a far lower chance of having any electoral impact. They want to abolish tuition fees, make the NHS 100% public, nationalise rail, introduce rent controls, abolish Trident, limit capitalism and jizz money all over every single public service.
You'd vote Lib Dem if you were focused on remain and you'd vote Labour if you wanted those kind of far left policies. So unless you're a climate fanatic (who I imagine Corbyn will try to woo anyway) I can't see why you'd vote Green.
You say it like these are bad things.
abolish tuition fees - Assume for a minute they do want to do this. It'll cost £100 billion to wipe out existing student debt. Boris's brexit deal with cost £70 billion. I know where i'd rather that money went.
make the NHS 100% public - As it should be. Privatisation has been a massive drain on the NHS finances. Nurses on NHS contracts are quiting to work for agencies where they get paid twice as much and do much less work. Everyone is making money at every turn, cleaning, cooking, parking, office supplies, IT. There will always be involvement with the private sector, but right now it's a cash cow at the expense of patient care.
nationalise rail - When existing contracts end they don't want to renew them. The East coast mainline does perfectly well nationalised, goes to pot under private ownership. If Germany can run the buses, trains and freight in 12 European countries - why can't we use the same private/public model in the UK?
introduce rent controls - Much needed. Rent is higher than mortgages, houses are being bought regularly to be put on rent, prices are driven up by this, forcing more people to rent and less to buy. We also need controls on rogue landlords.
abolish Trident - Not to eager on this personally. A nuclear detterent is probably still useful. We'd be much safer though if we took the Scandanavian approach to foreign policy though - rather than the dreams of empire. Trident isn't going to keep the Russians at bay if they wanted to invade, we don't have enough bombs to wipe out Russia, whereas they do. The MAD doctrine doesn't apply. Seems wiser to invest in the navy, airforce, army, a military cyber wing and invest in missile defence or hypersonic missiles - rather than trident.
limit capitalism - You mean ask them to pay taxes just like you and i do? Or prevent them from behaving in the manner that caused the global financial crash of 2008?
jizz money all over every single public service. - Public services? Who needs them. If we'd all just die at our desks it'd be much more cost effective.