Why has this discussion turned again in a creationist-evolutionist dÓck contest ??
As far as it goes the title is misleading : life began in water. Liquid water. Warm liquid water. Which is the basic solvent for a lot of biological reactions.
Now to know if it began in shore line waters or in pond waters is just a scientific detail (and matter of ego contest)
But just a remark
PNAS < Nature or Science