natural gas emissions are not less harmful
Methane emissions are an issue with basically all uses of gas that has been underestimated in the past and only in recent years it's more widely recognized how problematic that is. A lot of the "gas is greener than X" messaging from the past is simply no longer true if you consider methane emissions.
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.