Leviticus 18  This chapter begins with an important declaration: "I am the LORD your God." (v2) This declaration is repeated in verses 4, 5, 6, 21, and 30.   The LORD, God of Israel has called out His people to be holy as He is holy.  He has revealed His will for them, that they would know the difference between what is clean and what is unclean;  what is holy and what is profane.  He has provided for them the good news - that when they sin, there is a way to forgiveness and cleansing by the sacrifices of an atonement offering.   God has more to teach His people regarding His standards, His will for them...

The Israelites are warned to "not do what is done in the land of Egypt where you lived, nor are you to do what is done in the land of Canaan where I am bringing you; you shall not walk in their statutes.  You are to perform My judgements and keep My statutes, to live in accord with them; I am the LORD your God." ( verses 3-4)  The reason is given in verses 24-25 "Do not defile yourselves by any of these things; for by all these the nations which I am casting out before you have become defiled.  For the land has become defiled, therefore I have visited its punishment upon it, so the land has spewed out its inhabitants."  And verse 27 "for the men of the land who have been before you have done all these abominations and the land has become defiled."  Verse 30 " Thus you are to keep My charge, that you do not practice any of the abominable customs which have been practiced before you, so as not to defile yourselves with them; I am the Lord your God."

The rest of the chapter explains what these abominations are:
Pornography ( uncovering nakedness)
Incest of any kind.
Lewdness.
Impurity.
Adultery.
Idolatry.( In particular the offering of children to Molech)
Homosexuality.
Bestiality

These were customs, manners, or even statutes of both Egypt and Canaan.  They were common and legal.   But they were  ( and are) "abominations" in God's sight.   He abhors this behavior.  He detests it.
The LORD detests these customs so much that He spewed the inhabitants out of the land.   Notice that the land was defiled, not by the physical pollution of gases and litter and such ( as we focus on in this day and age),  but it was defiled and polluted by the sinful behaviors of the people.

"And do not be conformed to this world..." Paul writes in Romans 12.  This is exactly the same message, isn't it?  The world practices these same sinful acts now as they did in the days of Moses and in the days of Paul.  There is nothing new under the sun.. as Solomon wrote.   Has God changed His mind about this?  NO! Not at all.  Sin is still sin,  these things that defiled the lands of Canaan and Egypt and Israel... defile our land too.  God is bringing His judgements against this land and it is as certain as the judgements that He brought on those in Canaan.  "... but be transformed by the renewing of your mind, so that you may prove ( discern) what the will of God is, that which is good, acceptable, and perfect." Paul continues.  We belong to a holy God Who loves us and wants us to obey His commands in His Word, which has not changed.   These are the Words of life and the only way to know Him. He still calls for us to be holy.  It is still His will that we do not practice these things which He abhors.

O Holy Father,  we praise You and worship You alone.  We do not want to be fashioned according to the world's patterns and customs.  We want to be renovated and refashioned in our thinking so that we can know what Your good and perfect and acceptable plans are for us.  This world is not our home. Our home is with You for all of eternity.  Lead us away from these temptations and deliver us from the evil one who comes to deceive, kill, and destroy.  Lead us in Your righteousness for Your Name's sake.  For Your honor and glory.  Come and help us Holy Spirit.  We ask in Jesus' Name.  Amen