Most socially/globally conscious jpop artists?

[ohsixthirty]

So...I was curious, who do you think are the most socially or globally conscious jpop artists? What I mean is, who are the artists that are trying to make a change, speaking out about global warming or pollution (i rememeber mika nakashima mentioning this issue a while back), making donations for poverty or disaster relief, etc...? Or even just making songs relating to these issues?

Does anyone know?