If Poland is indeed the Saudi Arabia of natural gas in Europe, be extra wary. We have such places here. One is in Pennsylvania another in New York, in the catskills where well water is so tainted with methane the water coming out of the faucets catch on fire. Water wells exploded.
We have methane in our ground water also but it's attributed to shallow gas deposits. And as for drinking water contamination, try home filters. Everyone should have regardless.
1. LNG terminal in Swinoujscie will be operational in a few years, so Poland would be able to buy liquid gas from USA and Katar rather than spoil Polish environment
No, Poland needs its own energy source.