2009-02-01 : A permanent that’s both black and green will allow both abilities to trigger (as will separate black permanents and green permanents, of course).

2009-02-01 : The “intervening ‘if’ clause” means that (1) the ability won’t trigger at all unless you control a permanent of the specified color, and (2) the ability will do nothing unless you control a permanent of the specified color at the time it resolves.