Other carbon based compounds and other molecules may be explained in a similar way as methane.

Sounds great until you realise in a world of finite carbon based fuels it makes no real difference.

Bio-ethanol is usually obtained from the conversion of carbon based feedstock.

As we are carbon based, so-there could be-there certainly were!

It does so through taxing carbon emissions (85% of American energy production is carbon based).

There is no reason why a life form cannot be metal instead of carbon based.

The scientists involved in the project hypothesized that the vast majority, if not all, of extra-solar biology will be carbon based.

It is even conceited of us to continue to assume that all life must be carbon based.

The World still generates just a much carbon based electricity.

The nucleophile can be carbon, nitrogen or oxygen based.