[Enjoymmsq]

I think we should use solar energy to vapourise sea water, then use existing landforms and wind patterns to condense the water vapour, and collect it in large natural tanks by placing artificial barriers at the end of existing valleys.

[RLRWai4B]

I've been using about 10 Megajoules of electricity per day to heat this room during winter I'm wondering if using petrol might be less expensive.

Thermal coal is what, around $90/T? Lets say $250 delivered. And maybe 34Mj/kg. That'd be cheaper, but you might need a boiler...

[AOE6q4bu]

I've been using about 10 Megajoules of electricity per day to heat this room during winter I'm wondering if using petrol might be less expensive.

Not unless you sniff it, I think.