Earth has a few billion years of habitability left, with the Sun's increasing brightness making it too hot to sustain oceans in about 1 billion years, long before the Sun swells into a red giant and engulfs the planet in roughly 4.5 to 5 billion years, though humanity faces near-term risks from climate change or self-inflicted catastrophes, potentially shortening our window of survival.
Points of no return
Current warming, likely to reach 1.5 degrees Celsius above preindustrial times by around 2030, has already pushed coral reefs past their limit. Unless things change, warming is likely to reach about 3 degrees Celsius within decades.
As a result of these processes, multicellular life forms may be extinct in about 800 million years, and eukaryotes in 1.3 billion years, leaving only the prokaryotes.
Humans Could Live For 1,000 Years by 2050—Ushering in the Dawn of 'Practical Immortality,' Futurists Say. Some experts warn that this radical change may remain out of reach for many, due to societal and economic challenges. Technology futurists foresee advances that will enable humans to live up to 1,000 years.
Kurzweil has forecast that by 2030, humans can accomplish what was previously considered impossible—biological immortality. The statement, though incredible, is not an imaginary one. Rather, it is underpinned by the rapid advancement of major scientific disciplines like nanotechnology, genetics, and robotics.
Based on mathematical models, our longest potential lifespan is around 150 years. But, we know that genetic manipulation of model organisms increases it by up to 100%. So, humans can live up to 244 years. But he doesn't stop there.
The direct death toll alone could amount to tens to hundreds of millions of people. Or maybe even billions. If, in an absolute worst case scenario, 99 percent of the world population would die, that would leave 80 million people alive. Meaning in terms of population we would be back to 2500 BC.
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The Science Is Clear
It will never be too late to take meaningful action to protect people and the planet. However, decades of increasing carbon emissions from oil, gas and coal are harming the natural and social systems upon which all humanity depends, threatening devastation.
Scientists are saying that by 2035 our climate will reach a point of no return. If global mean temperatures go to 2C or above, there will be no going back to how things once were. If this is reach possible unstoppable feedback loops could occur and make temperatures potentially go even higher.
The Earth could be doomed to breach the symbolic 1.5C warming limit in as little as three years at current levels of carbon dioxide emissions. That's the stark warning from more than 60 of the world's leading climate scientists in the most up-to-date assessment of the state of global warming.
No matter how advanced technology gets, it might be impossible for our bodies to go on forever. Some researchers believe there's a limit on how long it's physically possible to live: perhaps 125 years. But what if we don't need our bodies at all?
The Doomsday Clock is a symbol that represents the estimated likelihood of a human-made global catastrophe, in the opinion of the nonprofit organization Bulletin of the Atomic Scientists. Doomsday Clock. The Doomsday Clock pictured at its setting of "89 seconds to midnight", last changed in January 2025.
We see the spikes in extinction rates marked as the five events:
If someone survived past ten years old, they could expect to live until they were fifty or sixty, with some happily living until their eighties, an age we would consider elderly in an advanced, modern, country.
A landmark study shows the reversal of biological aging in humans. The researchers used oxygen therapy in a pressurized chamber to reverse aging in two key biological clocks. The study showed lengthening in the telomeres of chromosomes and a decrease in cells known to cause aging.
Well, if Mindy is anything to go by, it could lead to humans in the year 3000 having hunched backs and arched necks—and even suffering from something scientists are calling "tech neck," which causes the neck to sit slightly more forward and down as if hunched over.
In world demographics, the world population is the total number of humans currently alive. It was estimated by the United Nations to have exceeded eight billion in mid-November 2022.
3, the Lord sets a limit on His patience. He declares mankind's existence on earth (under these circumstances) will be limited to 120 years. God was not speaking of a single person's lifespan but of the time until the flood would come. In 120 years, a flood would come and erase all life from the earth.
Some of the damage that occurs in our bodies can be reversed, but with some 37 trillion different cells of 200 different types all affecting one another, there are cascading impacts. Your body's repair systems simply cannot keep up, catching and reversing every last bit of molecular damage.
Further lifestyle risk factors that significantly reduce a person's life expectancy include: obesity* (3.1/3.2 years), excessive alcohol consumption** (3.1 years, men only), and a high intake of red meat (2.4 years in women; 1.4 years in men). However, a body mass index lower than 22.5 kg/ m2.