Your pleading is brillant and is indeed the voice of Reason. Any rational person, who has spent some amount of time trying to understand the processes of life on this planet, would agree with you. You might perhaps even end up convincing individually a majority of the people, but unfortunately this will not be enough to move substantially towards the right direction, as long as the elites that govern this world will keep acting in favour of their interests. Capitalism, like life and nature in general (yes, capitalism is actually an expression of natural forces), cannot help growing and expanding, until it destroys itself. It is exactly like when you leave an orange outside on the ground: life will develop upon it, until it disapears.
This is to say that in my view Reason will not be sufficient to massively adopt an ecology ethic. For a long time morals was enforced by religion, now it is dictated by the mass media, in accordance with the will of the capitalist elites. Indeed TV has replaced the priests who encouraged us to be charitable. TV shows a selection of the disasters and the injustices which take place all around world and excites our indignation, which makes us feel good. But the paradise presented by the mass media consists only in everybody having a nice home, a car, a lot of gadgets and an hyperactive sexual life, as shown in TV series. This hope is far from being sublime, and is certainly much weaker than the hope proposed by the old religions. For this reason, I think that the “ethics” presently proposed by the mass media will collapse sooner or later, to be replaced, when things will go really bad, by an ethic based on a more exalting ideal.
A strong ethic needs to build on an elevated ideal. Unfortunately, the ideal you are proposing, which is just to have a nice and peaceful life under a tree is not exciting enough in my view. We need to find something more exciting, without coming back again to God, eternal life and paradise, in which a great majority of people are still prepared to believe.