St Hubert is inaccurately known as the patron saint of hunters. Born in 656 AD, Toulouse, France. As the legend says, he lived in a forest in the Ardennes as a hunter. On Good Friday, while every one else was at Church, he was hunting in the forest, following a magnificent buck.
Suddenly, as the stag turned round, a crucifix appeared between his antlers and a voice said, ‘Hubert, unless you turn to the Lord and lead a holy life, you shall quickly go down to hell’. Hubert dismounted his horse and prostrated himself, saying, ‘Lord, what would You have me do?’ and the reply came, ‘Go and seek Lambert and he will instruct you’. Hubert then went to Bishop Lambert who became his spiritual guide. Hubert gave all his wealth to the poor and studied for priesthood. He later became Bishop of Leige in 708 AD.
St Hubert later became honored as the originator of ethical hunting behaviour, although he renounced hunting after he had his vision. Even so, God saw Hubert's life of hunting sinful, which led him to go to hell.
I believe St. Hubert's story is related to Earth Day because it reminds us that we should not harm nature's animals. God himself in the story even said it was a sin. Just like Earth Day Hubert stopped harming animals just like every one else should.