Is an 'environment' necessary to become able to speak English?

We often hear the claim that "to become able to speak English, you need to place yourself in an environment surrounded by ...

The Limits of 'Immersing Yourself in an English Environment.' The English Barrier I, an Overseas University Student, Am Finally Facing

Recently, I have been feeling a massive 'English barrier'.First, to give you a little background on myself, objectively ...