before humans were on earth.
20 million years ago
The earth formed around 4.2 billion years ago, but it would have been too hot for water to liquidize at that point. I think around 3.8 billion years ago, but this is easy to look up online.
A long Time ago
Yes, if propane escapes into the atmosphere it will be a greenhouse gas. Propane is a by-product of natural gas and petroleum refining. It is a fossil fuel and releases carbon dioxide when burnt.
A long time ago
Wood should be classed as Biomass, as it has grown and been cut for fuel within a time span of probably 100 years. Fossil fuel is that which has been created from vegetation that grew millions of years ago. The burning of biomass is not considered to add CO2 to the atmosphere, as it absorbed a similar amount during growth, in recent history.
the fossil fuel created is coal
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