First of all, they won't really do anything. Mainly the group will posture and continue to thumb their noses at Russia for the Ukraine matter. Oh, yeah, this was once the G8, but they kicked Russia out.
It was once the G6, until Canada was added. Why don't they include China and India, which have 36% of the world population, or Brazil, Mexico, South Africa and Saudi Arabia? Someday they will be, with Russia forgiven, and this will become the G15. Then they will truly be useless, like the United Nations.