Sun will become a red giant, engulfing Earth

In 4.5 billion years, the sun will become a red giant, engulfing Earth. However, extreme heat will make the planet uninhabitable in 1.3 billion years. Human-made climate change could drive species to extinction within centuries. Wet-bulb temperatures, which can be deadly, are predicted to rise due to climate change. The next hundred years will be critical for human life.