Every bit of wood, coal and oil in the world would only keep the Sun burning for a fraction of a second.
The Sun's gravitational pull is so strong that, even a dwarf planet 5,900,000,000 kilometres away from it (Pluto) is still kept in orbit of the Sun. There are more dwarf planets even further away than Pluto which are kept in orbit by the Sun.
If you could take a journey in an normal airliner flying at its normal speed (about 644 km an hour) travelling from Earth to the Sun, it would take 20 years to reach your destination, and that's without stopping.
If the Sun was brighter, it would be hotter and would have burnt off its hydrogen fuel billions of years ago. This means that, if the Sun is any different to how it is now, life on Earth would not exist. It is the perfect size, perfect age, perfect distance, perfect temperature and perfect brightness for life to exist on a planet like Earth.
'Daylight' on Pluto probably isn't very bright. Not like a sunny day on Earth. Imagine how small the Sun must look from so far away.....and that's if Jupiter or one of the other gas giants doesn't get in the way.
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