The key is that our belief system determines what we think is possible, and what we think is possible influences the results we create or allow in life.
The interactions of all our individual worldviews shapes the condition of humanity and therefore, given our technologies, of planet Earth.

"Molecules awoke one morning to find that atoms were inside them, enfolded in their very being. And cells awoke one morning to find that molecules were actually inside them, as part of their very being. And you might awake one morning and find that nature is a part of you, literally internal to your being. You are not just a part of nature, nature is a part of you. And for just that reason, you treat nature as you would treat your lungs or your kidneys. A spontaneous environmental ethics surges forth from your heart, and you will never again look at a river, a leaf, a deer, a robin, in the same way."
Ken Wilber

If you think that you are connected with all of life, you will be more apt to steward your environment with care and treat others with compassion.

"What our Seventh Generation will have is a consequence of our actions today"
Winona LaDuke, Annishnabe

If you think that only your race or social class should rule, your behavior will most likely be very brutal.

"We shall have World Government whether or not we like it. The only question is whether World Government will be achieved by conquest or consent."
Paul Warburg, author of "The Federal Reserve Act", speaking to the senators

If you believe the world is about to end in a giant apocalypse and only the followers of your religion will be saved, then a sound ecology and caring for others wouldn’t be likely to show up on your to-do list.

"How you imagine the world determines how you live in it." David Suzuki

"In our whole-systems thinking tool, the Sector Navigator, we have “Worldview” at the center because we each experience every aspect of our lives through the lens of our set of beliefs – our Worldview"
Foster Gamble