Yes, Virginia, I have been looking for many years into environmental problems and their causes.
And ecological problems due to human "activities" are not so recent as many think, but there were and are also other than human interferences.
Climate changes occurred during earth history, long before the human species was "born":
And smaller climate variations followed during human history, for instance
But the list of environmental issues is very long, and the human presence on earth caused significant impacts:
These are just a few of the main causes for a climatic change, which can be caused by human and non-human interferences (check references and links):
Useful tools to assess the ecological impacts of single products, services, activities, etc. are the so called "life cycle assessments", involving every step, action, interaction, "footprint", circumstances, etc., from the cradle to the grave.
And we know that since long, the human impact is one of the main causes of environmental depletion, because certain changes are much too fast to be caused alone by natural processes.
Additionally, most ruling and warfaring clans, monarchs, ministers, big bosses or "religious" leaders did/do not really care for the welfare of their own people - in the past and in present times ... Humans are too often the worst ennemy of their own species - at all the levels.
With the present propaganda, hate, threatening, shaming and insulting campaigns, most people don't know whom they can trust, as radicalism, fascism, sexism and perversion are on the rise.