Methane emissions from oil extraction aren't negligible either so it depends on your point of reference. It's almost certainly better to burn methane in a power plant and use BEVs where possible but that's a long way from possible in heavy goods vehicles for example (they will need batteries measured in MWh for a start).

There are also many dimensions to emissions, global warming potential is important but from a personal point of view I worry more about the impact on my children's health from the other emissions like particulates, NOx and aromatic hydrocarbons.