If I were a religious man, I might say the following to my fellow Jews on Yom Kippur, when Jews gather to pray and beg forgiveness, when they lament the wrongs that they have done.
On Yom Kippur, our prayers tell us that God will listen to our pleas and, we hope, will forgive us our transgressions against him. It is said, though, that God will not forgive our transgressions against our fellows—for this, we must make amends with those we have wronged. What if those we harm are all creatures, and the Earth, and those yet to be? We are causing the Earth to warm, and to change, and causing the deaths and the ends of many forms of the world. If we do not act to address this within the next few years, but instead allow atmospheric carbon concentrations to increase beyond a critical threshold, then the Earth will suffer massive changes. We may well ruin the Earth for the next 50 generations. Adam and Eve ate from the tree of knowledge, but not from the tree of life, and we were banished from Eden for their transgressions. If we do not now change our course, then for 50 generations the Earth may well be turned into a place of "hell and high water", with terrible droughts and heat waves, extreme storms, rising seas, massive extinctions, wars between people fighting for the remaining scraps, and refugees fleeing an ever-changing climate. The creatures we destroy will never be restored and it will take untold years for the vibrant richness we may observe in our everyday lives to flourish once again.