If the sun were exhausted of its nuclear energy what would happen to our energy resources on earth?

If the sun were to exhaust its nuclear energy, it would cease to emit light and heat, leading to a drastic drop in temperatures on Earth. This would disrupt photosynthesis, collapsing food chains and severely impacting ecosystems. Renewable energy sources like solar power would become obsolete, and reliance on fossil fuels would increase, exacerbating environmental issues. Ultimately, life on Earth as we know it would become unsustainable.