.. all else is commentary (or worse; see WD, say)
-=*=-
It should not take a Newton or a Galileo to realise that doing nothing is not an option - except in the possible case of someone who's merely waiting for Godot.
But in case an appeal to authority is thought desirable, consider Newton's 1st & 2nd laws as describing aspects of momentum[1]; easily understood as a body at rest tends to stay at rest; it will move if shoved hard enough, and ever faster with more push. The intermediary case of a body already moving is analogous; lacking any push it will continue on unchanged.
Going back to the case of doing nothing, we see that without a push, no change is possible. But change is definitely needed - IMHO, as usual and of course; any dissenter may now leave, tschüss!
For any lingering die-hard, the 'why?' change is needed are at least three:
1. The moral environment - reflexive altruism required.
2. The business environment - stop all the rip-offs required.
3. The physical environment - greedastrophe® must be averted.
The order is arbitrary; life as we know it will become increasingly difficult - outright impossible is the fear - without a sustainable biosphere operating within our 'comfort-zone.' Resource-restrictions are becoming apparent; skyrocketing oil-prices are a good indicator, but large food-price increases, even shortages - in Western markets - are the shock of the week.
Business rip-offs are causing trouble across the world, as already obscenely rich (so-called) élites gorge themselves ever richer - creating starving multitudes with their greed - and crime.
Morally, the sheople® have been thrown to the wolves. One doesn't need a Jesus or a Gandhi[2] to recognise the universal applicability of the Golden Rule and its corollary 'do no harm' (my attempted formalisation the chezPhil morality), nor the sad fact that such morals are being honoured mainly in the breach.
The time for arguing any of this is gone; anyone seeking details may find them elsewhere, but also somewhat scattered on this website.
I have already suggested my action plan at save the planet; in a nutshell it means getting a (proper!) morality, and lobbying our representatives to properly represent us. The most important reform is to make our morality scaleable, the same rules for us sheople and our so-called rulers: no lying, cheating, theft or murder. Sounds simple and it is, really just a matter of getting active. This plan is eminently doable[3] and what's better, it's been proven to work - but sadly, not for us, we the sheople, but for a minority, and even sadder, to crooked purposes. (I refer here to the M-W reported Israel Lobby.)
-=*=-
Once more around the loop: immorality and criminality are rife; our once jewel-like planet is under attack by the forces of darkness. To wit, the US is murdering for oil, Israel is murdering for land and water, and the mainly these days US-inspired capitalist system is raping the planet for resources - most often without sufficient recompense, in fact nowhere near. And these forces of evil don't care a fig where they drop either their murdering bombs, shit or pollution, hence the coming excess CO2-caused greedastrophe.
The 'greed is good' school just described (greed is neither good nor desired - except by the evil perpetrators), i.e. the rippers-off and murdering thieves will not listen. Since they only understand force, a countervailing force must be called forth - over to you, dear sheople.
-=*end*=-
Ref(s):
[1] momentum
«The question has been much debated as to what Sir Isaac Newton's contribution to the concept was. Apparently nothing, except to state more fully and with better mathematics what was already known. The first and second of Newton's Laws of Motion had already been stated by John Wallis in his 1670 work, Mechanica sive De Motu, Tractatus Geometricus: "the initial state of the body, either of rest or of motion, will persist" and "If the force is greater than the resistance, motion will result..."»
[wiki/Momentum]
[2] Seven Blunders of the World
« .. is a list that Mahatma Gandhi gave to his grandson Arun Gandhi, written on a piece of paper, on their final day together, not too long before his assassination. The seven blunders are:
Wealth without work
Pleasure without conscience
Knowledge without character
Commerce without morality
Science without humanity
Worship without sacrifice
Politics without principle
This list grew from Gandhi's search for the roots of violence. He called these acts of passive violence. Preventing these is the best way to prevent oneself or one's society from reaching a point of violence.
To this list, Arun Gandhi added an eighth blunder:
Rights without responsibilities»
[wiki/Seven Blunders of the World]
[3] doable
adjective informal within one's powers; feasible: none of the jobs were fun, but they were doable. [Oxford Pop-up]