Pope Francis, in Laudato Si, insists that, “Since everything is interrelated, concern for the protection of nature is also incompatible with the justification of abortion.” And “How can we genuinely teach the importance of concern for other vulnerable beings, however troublesome or inconvenient they may be, if we fail to protect a human embryo, even when its presence is uncomfortable and creates difficulties?” See here.
And what of the homosexual question? Isn't it also true that concern for the protection of nature is incompatible with the justification of homosexual acts?
Today so many, even within the Church, seek to justify homosexual acts. But, as the Roman barrister and statesman Cicero reminded us, "right is based, not upon men’s opinions, but upon Nature. This fact will immediately be plain if you once get a clear conception of man’s fellowship and union with his fellow-men. For no single thing is so like another, so exactly its counterpart, as all of us are to one another…And so, however we may define man, a single definition will apply to all.” [Laws I x 28-30]
Cicero goes on later to draw two conclusions of critical importance, namely that laws exist for the common good, and laws that deny fundamental human rights are not valid laws at all: “It is agreed, of course, that laws were invented for the safety of citizens, the preservation of States, and the tranquillity and happiness of human life, and that those who first put statutes of this kind in force convinced their people that it was their intention to write down and put into effect such rules as, once accepted and adopted, would make possible for them an honourable and happy life; and when such rules were drawn up and put in force, it is clear that men called them ‘laws’. It may thus be clear that in the very definition of the term ‘law’ there inheres the idea and principle of choosing what is just and true.”
Vatican II stressed that the moral goodness of the acts proper to conjugal life, ordered according to true human dignity, "does take only the good intentions and the evaluation of motives into account; objective criteria must be used, criteria drawn from the nature of the human person and of his acts, criteria which respect the total meaning of mutual self-giving and human procreation in the context of true love" (Gaudium et spes, n. 51).
This teaching is emphasized in the Declaration Persona humana: "The use of the sexual function has its true meaning and moral rectitude only in true marriage" (n. 5).
Homosexuality is objectively incapable of achieving "the total meaning of mutual self-giving and human procreation". In this regard the above-mentioned Declaration Persona humana says: "According to the objective moral order [Natural Law], homosexual relations are acts which lack an essential and indispensable finality" (n. 8).
May we not say that concern for the protection of nature is incompatible with the justification of homosexual acts?
Of course. So why doesn't Pope Francis say this in his Encyclical?
Related reading here.