Boston Globe: The state`s largest foundation will give $50 million to Boston-area nonprofits and efforts that fight climate change – one of the biggest gifts in recent years to that cause – in a campaign that marks a strategic shift for an organization that has never before publicized its charitable works. Over the next five years, the $1 billion Barr Foundation, the principal charitable vehicle for the famously private Amos Hostetter Jr. and his wife, Barbara, will give multiyear grants of …