I read, recently, about “LUCA”, from whom, every single one of us is descended. In fact, not just every single one of we humans, but every single living creature.
Isn’t that amazing? Yet, at some level, kind of obvious?
We humans have a tendency to think that we somehow parachuted onto this little planet, just appearing from nowhere, with no history prior to our arrival. This kind of thinking leads us to consider that, on Earth, there is Nature, and there are humans. It’s almost as if Nature is something separate from ourselves, either a place we go and visit on our holidays, or the less important than us part of the world.
But these two beliefs are delusions.
We evolved on this planet, along with every other living creature, past and present. The history of our “arrival” isn’t sudden, but it isn’t disconnected from the rest of existence either.
Advances in molecular genetics have revealed that all living things on Earth are descended from a single organism dubbed the last universal common ancestor, or LUCA, which emerged around 4 billion years ago. We also know that our planet is approximately 4.5 billion years old. During those first half a billion years, simple, then more complicated, organic molecules were spontaneously synthesised and assembled in larger complexes, eventually evolving into the primitive, single-celled LUCA. How did that happen? We really don’t know. But, then, we don’t really know what “life” is either, do we? We can’t even tell if a seed is dead or alive until it starts to change (or doesn’t).
There are many, many “creation myths” around the world. Every culture seems to have its own. Over the last hundred years or so we’ve been introduced to new ways of thinking about who we are, and where we came from. Yet even with evolutionary thinking we have a tendency to think of ourselves as different and separate. We present Homo Sapiens as the most highly developed form of life on the planet, and we don’t really consider how we might evolve in the future. We tend to think that evolution led to the creation of we humans, and then it stopped. It somehow reached its goal. And we give less consideration to what we share with the rest of the planet.
But, in fact, we came from somewhere, as did every other life form on our shared planet. Our ability to understand the molecules which exist inside our cells, and the discovery of how so many of the exact same molecules exist in other creatures, has opened the door to a different understanding.
LUCA is our shared common origin, and as we begin to trace LUCA’s evolution into the abundantly diverse forms of life which we have discovered so far, we come to understand ourselves as embedded, inextricably in a web of Life on this planet we call Earth. This little blue marble where LUCA came into existence, and gave birth to us all.
We are not disconnected. Neither from all the other living creatures, nor from each other. We share this planet. We share the same air, the same water, the same soil. We depend on each other. Despite the delusion of hyper-individualism, none of us can exist without creating mutually beneficial relationships with others, with our other common descendants.
What kind of future could there be for us, for our children and grandchildren, if we all took that shared reality on board and put collaboration ahead of competition? If we began to rate mutual benefit over self-centred greed? If we put more energy and attention into the creation, and maintenance, of the healthy environments in which all of LUCA’s descendants can thrive?
Heroes Not Zombies 