These comments are full of arguments where one person suggests a course of action and another person replies that the alternatives are worse (plastic vs paper, wild fish vs farmed, cleaning up plastic vs cutting carbon). It's impossible for anyone to fully foresee the environmental consequences of the products they buy. This is the reason why the only solutions to these problems is for our governments to impose Pigovian taxes for harms to the environment (and equal subsidies for helps to the environment). Then all the consequences of our choices filter back to us in monetary terms. No other method is capable of weighing all the different factors.