The global warming is a recurring event, temperature fluctuate in a cycle within this planet.
http//blogs.edf.org/climate411/wp-content/files/2007/06/last_400000_years.png
Thus it's not due to 'human morality' although specific human behavior of burning fossil fuel might have some correlation to the increase of temperature. Solution find alternative and cleaner energy, migrate away from fossil fuels such as oil, coal and gas.
Human morality and common sense nowadays, in relatively average comparison to 7th century middle east or other era in history, is much better. The frequency of burning people to death, torture, war / invasion, enslavement, religion persecution and oppression has decreased albeit not yet eradicated in entirely.
Society, nation and empire does rise and fall following it's cycle. The meek and humble will rise while the proud will fall. It has been a recurring pattern throughout history and no society are immune to the law. Those who were initially meek will became proud and they will experience a decline, due to their pride they refuse to accept the decline and amend accordingly but put forth a false image of their glory and superiority over others.
Be humble and smart.
None of you are superior compared to others, and none of you are preferred over others, everyone abide to the same rule.