Dear PF Forum, Actually I've never visited chemistry forum. It's cosmology and SR that interests me. Tomorrow at Thursday 30th July, 14:00 GMT. I have to present a service (religion) about global warming. But there's some facts that I need to know fast. Can anyone help me? What is the formula of methane combustion? I know that if you burn methane it will become CO2, what is the formula? CH4 + O2 + ?? -> CO2 + ?? What is the composition of car gasoline molecule? Just one type is enough. And what is the combustion reaction formula? Gasoline + O2 + ?? -> CO2 + ?? It's not about homework, it's just a catholic service every month in one of parishioner home. And tomorrow it's my turn to present about environment. The catholic encylic. Can anyone help me? The clock is ticking? I haven't even prepared the song, yet. Thanks in advance.