How many years are left for Earth?

Earth will remain habitable for approximately 1-1.5 billion more years before the Sun's increasing luminosity makes surface conditions too hot for life. The Sun will expand into a red giant in about 5 billion years, likely engulfing Earth. However, human-caused climate change could make Earth uninhabitable for civilization much sooner (centuries) unless we take action. The planet itself will exist until the Sun's death, but habitability is limited by solar evolution and potentially by our own actions.