The exact age of the earth is about 4.6 billion years old, formed at about the same time as the rest of our solar system. The oldest rocks geologists have been able to find are 3.9 billion years old.
the first life forms on earth were primitive, one-celled creatures that appeared about 3 billion years ago. That’s pretty much all there was for about the next two billion years. Then suddenly those single celled organisms began to evolve into multicellular organisms.
An Extinction Event, more commonly known as a mass extinction, is the the extinction of a large number of species within a short period of geological time. There have been 24 extinction events in all of Earth’s history – before the crab like creatures like us humans came around 200,000 years ago.
Mass extinctions always occur after a sudden, rapid, and uncontrollable change in global climate – which is obvious because only such widespread changes can kill off diverse species spread out over land and water in a short period of time. Conversely, mass extinctions could also affect the global climate as disappearance of a majority of life on Earth could upset the oxygen balance.
As photosynthesis increased, there were very few lifeforms that were able to consume enough of this new oxygen. There was nowhere for the toxic oxygen to go because there was no oxygen sink. As the oxygen content in the atmosphere and oceans increased, early life that was just forming was also dying away rapidly. This is why the Great Oxygenation Event also became the first known extinction event.
The other effect the oxygen catastrophe had was the formation of glaciers. The rise of oxygen naturally removed a lot of greenhouse gases from the atmosphere, most notably methane. Oxygen lowers temperatures, which is why wooded areas are so much cooler than cities today. The saturation of oxygen in the atmosphere lowered the overall temperature to 5°C lower than today and removed the ability of the atmosphere to keep the planet warm. Temperatures started falling steeply, heralding an ice age.
Lose biodiversity and the natural world including the life support systems as we know them will collapse. We depend on nature for the air we breathe, water we drink, the food and materials we use and the economy we rely on, and not least, for our health, inspiration and happiness”
“Earth provides enough to satisfy every man’s need, but not every man’s greed.”
As i mentioned earlier,the crab like creatures like us Humans came around 200,000 years ago.
since and then we are constantly hurting the nature “if Man is the greatest miracle on this planet then he is the greatest problem on this too”.
“We are no longer a small world on a big planet. We are now a big world on a small planet, where we have reached a saturation point,” said Prof Johan Rockström, executive director of the Stockholm Resilience Centre.
Climate change is seen globally as a major environmental risk, and in combination with environmental degradation via chemical pollution and habitat loss, it has the potential to have a severe impact on wildlife populations, particularly in freshwater ecosystems
Global population is expected to peak around 10 or 11 billion and with care, it’s possible that we may be able to sustain a habitable planet for that many humans more or less indefinitely. We may still become extinct through climate change, disease, nuclear war or meteorite impact but humanity probably has enough foresight and resources to avoid poisoning itself to death.
“The 21st century presents humanity with a dual challenge: to maintain nature in all of its many forms and functions and to create an equitable home for people on a finite planet. The UN 2030 Agenda for Sustainable Development Sustainable Development combines the economic, social and ecological dimensions necessary to sustain human society through the Anthropocene.
“The more clearly we can focus our attention on the wonders and realities of the universe about us, the less taste we shall have for destruction.”
I think every single day is Earth Day, Everyday is to appreciate the Mother Earth for offering and fulfilling every basic need of Mankind Food,Shelter,clothing and more…We don’t know how much Time we have remained
#celebrating the #WorldEarthDay