It's because of how it burns. It is true that you get more energy out producing the same amount of CO2 with gas compared to burning coal. This might sound counterintuitive but it has been studied and isn't controversial. Although I doubt that "one third" claim the other person made, but in principle that part of their argument is correct.
The issue is, all extracted methane isn't burned, and that's where the trouble starts. Over the past years, we've seen estimates for how much of it is lost into the atmosphere grow and grow. Some recent studies already claim more than 3%: https://www.scientificamerican.com/article/methane-leaks-era...
There has recently even been speculation that gas from certain sources where monitoring and environmental regulations aren't very strong could actually be worse than black coal. The truth is we don't really know this for sure yet.
You're right about the pollution, this and some other considerations are important as well. In certain countries air pollution is a serious issue. Germany doesn't really have this problem and the German plants have good filters. Germany has it's own coal, gas has to be imported. They're experiencing the effects of a dependency on foreign gas as we speak. So in the end, they might have actually better kept their coal power. I doubt it's going to happen though, coal is dead for purely political reasons. It's simply extremely unpopular.
The issue is, all extracted methane isn't burned, and that's where the trouble starts. Over the past years, we've seen estimates for how much of it is lost into the atmosphere grow and grow. Some recent studies already claim more than 3%: https://www.scientificamerican.com/article/methane-leaks-era...
There has recently even been speculation that gas from certain sources where monitoring and environmental regulations aren't very strong could actually be worse than black coal. The truth is we don't really know this for sure yet.
You're right about the pollution, this and some other considerations are important as well. In certain countries air pollution is a serious issue. Germany doesn't really have this problem and the German plants have good filters. Germany has it's own coal, gas has to be imported. They're experiencing the effects of a dependency on foreign gas as we speak. So in the end, they might have actually better kept their coal power. I doubt it's going to happen though, coal is dead for purely political reasons. It's simply extremely unpopular.