Who the hell cares what greenpeace says ? I do care about nature but i certainly pay no attention to what greenpeace says. And hippies in general.
They aren't a scientific institution, they are a lobby group for simpletons who cannot abide by the conclusions of scientists when they differ from their religious preconceptions. They are rather anti-science. They fish arguments from fringe individuals and see most scientists or engineers or physicians as suspects and in collusion with some vague plot from the industry they consider a priori as evil.
I liked them when they were defending the whales but nothing more.
Actually, finding out what to do to favour responsible behaviour in the industry and what to buy is extremely complicated. You need a lot of input from a lot of different kind of good experts. And the conclusions are not always intuitive.
Like when i read that depending on where you live driving an electric car pollutes more than driving a diesel. Or in some places installing solar panels isn't green because of the configuration of the electric grid. The answers are never simple.
That is why we need robust institutions with their own experts. As independent as possible.