Well phew, that's good news. Whilst according to the IPCC and most informed leaders we human beings are messing the climate up at a rate of knots that could see life as we know it end on the planet in only a century or two - if on the other hand ''we'' decide to take care of our home we could enjoy 1.75 Billion years of planet earth, I might even be able to learn to cook in that length of time !
From Scientific American -
Earth will be able to host life for just another 1.75 billion years or so, according to a study published on 18 September in Astrobiology. The method used to make the calculation can also identify planets outside the Solar System with long ‘habitable periods’, which might be the best places to look for life.
The habitable zone around a star is the area in which an orbiting planet can support liquid water, the perfect solvent for the chemical reactions at the heart of life. Too far from a star and a planet’s water turns to permanent ice and its carbon dioxide condenses; too close, and the heat turns water into vapor that escapes into space.
Habitable zones are not static. The luminosity of a typical star increases as its composition and chemical reactions evolve over billions of years, pushing the habitable zone outward. Researchers reported in March that Earth is closer to the inner edge of the Sun’s habitable zone than previously thought.
The inner edge of the Sun’s habitable zone is moving outwards at a rate of about 1 meter per year. The latest model predicts a total habitable zone lifetime for Earth of 6.3 billion–7.8 billion years, suggesting that life on the planet is already about 70% of the way through its run. Other planets — especially those that form near the outer boundary of a star’s habitable zone or orbit long-lived, low-mass stars — may have habitable-zone lifetimes of 42 billion years or longer.
But where can the human race go - Just as the sun brightens and the Earth becomes too hot for life, Mars will be entering the habitable zone. “If humans are going to be around in a billion years, I would certainly imagine that they would be living on Mars,”